The ‘Means of Reproduction’ and the Ultimate Purpose of Political Power

Laura Betzig, Despotism and Differential Reproduction: A Darwinian View of History (New Brunswick: AdelineTransation, 1983). 

Moulay Ismail Ibn Sharif, alias ‘Ismail the Bloodthirsty’, a late-seventeenth, early eighteenth century Emperor of Morocco is today little remembered, at least outside of his native Morocco. He is, however, in a strict Darwinian sense, possibly the most successful human ever to have lived. 

Ismail, you see, is said to have sired some 888 offspring. His Darwinian fitness therefore exceeded that of any other known person.[1]

Some have questioned whether this figure is realistic (Einon 1998). However, the best analyses suggest that, while the actual number of offspring fathered by Ismail may indeed be apocryphal, such a large progeny is indeed eminently plausible for a powerful ruler with access to a large harem of wives and/or concubines (Gould 2000; Oberzaucher & Grammer 2014).

Indeed, as Laura Betzig demonstrates in ‘Despotism and Differential Reproduction’, Ismail is exceptional only in degree.

Across diverse societies and cultures, and throughout human history, wherever individual males acquire great wealth and power, they convert this wealth and power into the ultimate currency of natural selection – namely reproductive success – by asserting and maintaining exclusive reproductive access to large harems of young female sex partners. 

A Sociobiological Theory of Human History 

Betzig begins her monograph by quoting a small part of a famous passage from the closing paragraphs of Charles Darwin’s seminal On the Origin of Species which she adopts as the epigraph to her preface. 

In this passage, the great Victorian naturalist tentatively extended his theory of natural selection to the question of human origins, a topic he conspicuously avoided in the preceding pages of his famous text. 

Yet, in this much-quoted passage, Darwin goes well beyond suggesting merely that his theory of evolution by natural selection might explain human origins in just the same way it explained the origin of other species. On the contrary, he also anticipated the rise of evolutionary psychology, writing of how: 

Psychology will be based on a new foundation, that of the necessary acquirement of each mental power and capacity by gradation. 

Yet this is not the part of this passage quoted by Betzig. Instead, she quotes the next sentence, where Darwin makes another prediction, no less prophetic, namely that: 

Much light will be thrown on the origin of man and his history 

In this reference to “man and his history”, Darwin surely had in mind primarily, if not exclusively, the natural history and evolutionary history of our species.

Betzig, however, interprets Darwin more broadly, and more literally, and, in so doing, has both founded, and for several years, remained the leading practitioner of a new field – namely, Darwinian history.

This is the attempt to explain, not only the psychology and behaviour of contemporary humans in terms of sociobiology, evolutionary psychology and selfish gene theory, but also to explain the behaviour of people in past historical epochs in terms of the same theory.  

Her book length monograph, ‘Despotism and Differential Reproduction: A Darwinian View of History’ remains the best known and most important work in this field. 

The Historical and Ethnographic Record 

In making the case that, throughout history and across the world, males in positions of power have used this power so as to maximize their Darwinian fitness by securing exclusive reproductive access to large harems of fertile females, Betzig, presumably to avoid the charge of cherry picking, never actually even mentions Ismail the Bloodthirsty at any point in her monograph. 

Instead, Betzig uses ethnographic data taken from a random sample of cultures from across the world. Nevertheless, the patterns she uncovers are familiar and recurrent.

Powerful males command large harems of multiple fertile young females, to whom they assert, and defend, exclusive reproductive access. In this way, they convert their power into the ultimate currency of natural selection – namely, reproductive success or fitness.

Thus, citing and summarizing Betzig’s work, not only ‘Despotism and Differential Reproduction’, but also other works she has published on related topics, science writer Matt Ridley reports:

[Of] the six independent ‘civilizations’ of early history – Babylon, Egypt, India, China, the Aztecs and the Incas… the Babylonian king Hammurabi had thousands of slave ‘wives’ at his command. The Egyptian pharaoh Akhenaten procured three hundred and seventeen concubines and ‘droves’ of consorts. The Aztec ruler Montezuma enjoyed four thousand concubines. The Indian emperor Udayama preserved sixteen thousand consorts in apartments guarded by eunuchs. The Chinese emperor Fei-ti had ten thousand women in his harem. The Inca… kept virgins on tap throughout the kingdom” (The Red Queen: p191-2; see Betzig 1993a).

In a contemporary context, I wonder whether the ostensibly ‘elite’ all-female bodyguard of Arab socialist dictator, Colonel Gadaffi, his so-called ‘Amazonian Guard’ (aka ‘Revolutionary Nuns’), served a similar function.

Given the innate biological differences between the sexes, physical and psychological, women are unlikely to make for good bodyguards anymore than they do effective soldiers in wartime, and, judging from photographs, Gadaffi’s elite bodyguard seem to have been chosen at least as much on account of their youth and beauty as on the basis of any martial prowess. Certainly they did little to prevent his exection by rebels in 2011.

Moreover, since his overthrow and execution, accusations of sexual abuse have inevitably surfaced, though how much credence we should give to these claims is debatable.[2]

Such vast harems as those monopolized by ancient Egyptian pharaohs, Chinese emperors and Babylonian kings seem, at first, wholly wasteful. This is surely more fertile females than even the horniest, healthiest and most virile of emperors could ever hope to have even sex with, let alone successfully impregnate, in a single lifetime. However, as Betzig acknowledges: 

The number of women in such a harem may easily have prohibited the successful impregnation of each… but, their being kept from bearing children to others increased the monarch’s relative reproductive accomplishment” (p70). 

In other words, even if these rulers were unable to successfully impregnate every concubine in their harem, keeping them cloistered and secluded nevertheless prevented other males from impregnating them, which increased the relative representation of the ruler’s genes in subsequent generations.

To this end, extensive efforts also were made to ensure the chastity of these women. Thus, even in ancient times, Betzig reports: 

Evidence of claustration, in the form of a walled interior courtyard, exists for Babylonian Mai; and claustration in second story rooms with latticed, narrow windows is mentioned in the Old Testament” (p79). 

Indeed, Betzig even proposes an alternative explanation for early evidence of defensive fortifications

Elaborate fortifications erected for the purposes of defense may [also] have served the dual (identical?) function of protecting the chastity of women of the harem” (p79). 

Indeed, as Betzig alludes to in her parenthesis, this second function is arguably not entirely separate to the first. 

After all, if all male-male competition is ultimately based on competition over access to fertile females, then this surely very much includes warfare. As Napoleon Chagnon emphasizes in his studies of warfare and intergroup raiding among the Yąnomamö Indians of the Amazonian rainforest, warfare among primitive peoples tends to be predicated on the capture of fertile females from among enemy groups.[3]

Therefore, even fortifications erected for the purposes of military defence, ultimately serve the evolutionary function of maintaining exclusive reproductive access to the fertile females contained therein. 

Other methods of ensuring the chastity of concubines, and thus the paternity certainty of emperors, included the use of eunuchs as harem guards. Indeed, this seems to have been the original reason eunuchs were castrated and later became a key element in palace retinues (see The Evolution of Human Sociality: p45). 

Chastity belts, however, ostensibly invented for the wives of crusading knights while the latter were away on crusade, seem to be a modern myth.

The movements of harem concubines were also highly restricted. Thus, if permitted to venture beyond their cloisters, they were invariably escorted. 

For example in the African Kingdom of Dahomey, Betzig reports: 

The king’s wives’… approach was always signalled by the ringing of a bell by the women servant or slave who invariably preceded them [and] the moment the bell is heard all persons, whether male or female , turn their backs, but all the males must retire to a certain distance” (p79). 

Similarly, inmates of the Houses of Virgins maintained by Inca rulers:

Lived in perpetual seclusion to the end of their lives… and were not permitted to converse, or have intercourse with, or to see any man, nor any woman who was not one of themselves” (p81-2). 

Feminists tend to view such practices as evidence of the supposed oppression of women

However, from a sociobiological or evolutionary psychological perspective, the primary victims of such practices were, not the harem inmates themselves, but rather the lower-status men condemned to celibacy and ‘inceldom’ as a consequence of royal dynasties monopolizing sexual access to almost all the fertile females in the society in question. 

The encloistered women might have been deprived of their freedom of movement – but many lower-status men in the same societies were deprived of almost all access to fertile female sex partners, and hence any possibility of passing on their genes, the ultimate evolutionary function of any biological organism. 

In contrast, the concubines secluded in royal harems were not only able to reproduce, but also lived lives of relative comfort, if not, in some cases, outright luxury, often being: 

Equipped with their own household and servants, and probably lived reasonably comfortable lives in most respects, except… for a lack of liberal masculine company” (p80). 

Indeed, seclusion, far from evidencing oppression, was primarily predicted on safety and protection. In short, to be imprisoned is not so bad when one is imprisoned in a palace! 

Finally, methods were also sometimes employed specifically to enhance their fertility of the women so confined. Thus, Ridley reports: 

Wet nurses, who allow women to resume ovulation by cutting short their breast-feeding periods, date from at least the code of Hammurabi in the eighteenth century BC… Tang dynasty emperors of China kept careful records of dates of menstruation and conception in the harem so as to be sure to copulate only with the most fertile concubines… [and] Chinese emperors were also taught to conserve their semen so as to keep up their quota of two women a day” (The Red Queen: p192). 

Corroborating Betzig’s conclusions but subsequent to the publication of her work, researchers have now uncovered genetic evidence of the fecundity of one particular powerful ruler (or ruling male lineage) – namely, a Y chromosome haplogroup, found in 8% of males across a large region of Asia and in one in two hundred males across the whole world – the features of which are consistent with its having spread across the region thanks to the exceptional prolificity of Genghis Khan, his male siblings and descendants (Zerjal et al 2003). 

Female Rulers? 

In contrast, limited to only one pregnancy every nine months, a woman, howsoever rich and powerful, can necessarily bear far fewer offspring than can be sired by a man enjoying equivalent wealth, power and access to multiple fertile sex partners, even with the aid of evolutionary novelties like wet nurses, bottle milk and IVF treatment. 

As a female analogue of Ismail the Bloodthirsty, it is sometimes claimed that a Russian woman gave birth to 69 offspring in the nineteenth-century. She was also supposedly, and very much unlike Ismail the Bloodthirsty, not a powerful and polygamous elite ruler, but rather a humble, monogamously married peasant woman. 

However, this much smaller figure is both physiologically implausible and poorly sourced. Indeed, even her name is unknown, and she is referred to only as the wife of Feodor Vassilyev. It is, in short, almost certainly an urban myth.[4]

Feminists have argued that the overrepresentation of males in positions of power is a consequence of such mysterious and non-existent phenomena as patriarchy or male dominance or the oppression of women.

In reality, however, it seems that, for women, seeking positions of power and wealth simply doesn’t have the same reproductive payoff as for men – because, no matter how many men a woman copulates with, she can usually only gestate, and nurse, one (or, in the case of twins or triplets, occasionally two or three) offspring at a time. 

This is the essence of Bateman’s Principle, later formalized by Robert Trivers as differential parental investment theory (Bateman 1948; Trivers 1972).

This, then, in Darwinian terms, explains why women are less likely to assume positions of great political power.

It is not necessarily that they wouldn’t want political power if it were handed to them, but rather that they are less willing to make the necessary effort, or take the necessary risks to attain power.

Indeed, among women, there may even be a fitness penalty associated with assuming political power or acquiring a high status job. Thus, such jobs tend to be, not only high status, but also usually high stress and not easily combined with motherhood.

Indeed, even among baboons, it has been found that high-ranking females actually suffer reduced fertility and higher rates of miscarriages, possibly on account of hormonal factors (Packer et al 1995).

Kingsley Browne, in his excellent book, Biology at Work: Rethinking Sexual Equality (which I have reviewed here), noting that female executives also tend to have fewer children, tentatively proposes that a similar mechanism may be at work among humans:

Women who succeed in business tend to be relatively high testosterone, which can result in lower female fertility, whether because of ovulatory irregularities or reduced interest in having children. Thus, rather than the high-powered career being responsible for the high rate of childlessness, it may be that high testosterone levels are responsible for both” (Biology at Work: p124).

Therefore, it may well be to woman’s advantage to marry a male with a high status, powerful job, but not to do such a job for herself. That way, she obtains the same wealth and status as her husband, and the same wealth and status for her offspring, but without the hard work it takes to achieve this status.

What is certainly true is that social status and political power does not have the same potential reproductive payoff for women as it did for, say, Ismail the Bloodthirsty.

This calculus, then, rather than the supposed oppression of women, explains, not only the cross-culturally universal over-representation of men in positions of power, but also much of the so-called gender pay gap in our own societies (see Kingsley Browne’s Biology at Work: reviewed here). 

Perhaps the closest women can get to producing such a vast progeny is maneuver their sons into having the opportunity to do so.

This might explain why such historical figures as Agrippina the Younger, the mother of Nero, and Olympias, mother of Alexander the Great, are reported as having been so active, and instrumental, in securing the succession on behalf of their sons. 

The Purpose of Political Power? 

The notion that powerful rulers often use their power to gain access to multiple nubile sex partners is, of course, hardly original to sociobiology. On the contrary, it accords with popular cynicism regarding men who occupy positions of power. 

What a Darwinian perspective adds is the ultimate explanation of why political leaders do so – and why female political rulers, even when they do assume power, usually adopt a very different reproductive strategy. 

Moreover, a Darwinian perspective goes beyond popular cynicism in suggesting that access to multiple sex partners is not merely yet another perk of power. On the contrary, it is the ultimate purpose of power and reason why men evolved to seek power in the first place. 

As Betzig herself concludes: 

Political power in itself may be explained, at least in part, as providing a position from which to gain reproductively” (p85).[5]

After all, from a Darwinian perspective, political power in and of itself has no intrinsic value. It is only if power can be used in such a way as to maximize a person’s reproductive success or fitness that it has evolutionary value. 

Thus, as Steven Pinker has observed, the recurrent theme in science fiction film and literature of robots rebelling against humans to take over the world and overthrow humanity is fundamentally mistaken. Robots would have no reason to rebel against humans, simply because they would not be programmed to want to take over the world and overthrow humanity in the first place. 

On the other hand, humans have been programmed to seek wealth and power – and to resist oppression and exploitation. This is why revolutions are a recurrent feature of human societies and history.

But we have been programmed, not by a programmer or god-like creator, but rather by natural selection.

We have been programmed by natural selection to seek wealth and power only because, throughout human evolutionary history, those among our ancestors who achieved political power tended, like Ismail the Bloodthirsty, also to achieve high levels of reproductive success as a consequence. 

Darwin versus Marx 

In order to test the predictive power of her theory, Betzig contrasts the predictions made by sociobiological theory with a rival theory – namely, Marxism

The comparison is apposite since, despite repeated falsification at the hands of both economists and of history, Marxism remains, among both social scientists and laypeople, perhaps the dominant paradigm when it comes to explaining social structure, hierarchy and exploitation in human societies.  

Certainly, it has proven far more popular than any approach to understanding human dominance hierarchies grounded in ethology, sociobiology, evolutionary psychology or selfish gene theory

There are, it bears emphasizing, several similarities between the two approaches. For one thing, each theory traces its origins ultimately to a nineteenth-century Victorian founder resident in Britain at the time he authored his key works, namely Charles Darwin and Karl Marx respectively.  

More importantly, there are also substantive similarities in the content and predictions of both these alternative theoretical paradigms. 

In particular, each is highly cynical in its conclusions. Indeed, at first glance, Marxist theory appears superficially almost as cynical as Darwinian theory. 

Thus, like Betzig, Marx regarded most societies in existence throughout history as exploitative – and as designed to serve the interests, neither of society in general nor of the population of that society as a whole, but rather of the dominant class within that society alone – namely, in the case of capitalism, the bourgeoisie or capitalist employers. 

However, sociobiological and Marxist theory depart in at least three crucial respects. 

First, Marxists propose that exploitation will be absent in future anticipated communist utopias

Second, Marxists also claim that such exploitation was also absent among hunter-gatherer groups, where so-called primitive communism supposedly prevailed. 

Thus, the Marxist, so cynical with regard exploitation and oppression in capitalist (and feudal) society, suddenly turns hopelessly naïve and innocent when it comes to envisaging future unrealistic communist utopias, and when contemplating ‘noble savages’ in their putative ‘Eden before the fall’.

Unfortunately, however, in her critique of Marxism, Betzig herself nevertheless remains somewhat confused in respect of this key issue. 

On the one hand, she rightly dismisses primitive communism as a Marxist myth. Thus, she demonstrates and repeatedly emphasizes that:

Men accrue reproductive rights to wives of varying numbers and fertility in every human society” (p20).

Therefore, Betzig, contrary to the tenets of Marxism, concludes:

Unequal access to the basic resource which perpetuates life, members of the opposite sex, is a condition in [even] the simplest societies” (p32; see also Chagnon 1979).

Neither is universal human inequality limited only to access to fertile females. On the contrary, Betzig observes:

Some form of exploitation has been in evidence in even the smallest societies… Conflicts of interest in all societies are resolved with a consistent bias in favor of men with greater power” (p67).

On the other hand, however, Betzig takes a wrong turn in refusing to rule out the possibility of true communism somehow arising in the future. Thus, perhaps in a misguided effort to placate the many leftist opponents of sociobiology in academia, she writes:

Darwinism… [does not] preclude the possibility of future conditions under which individual interests might become common interests: under which individual welfare might best be served by serving the welfare of society… [nor] preclude… the possibility of the evolution of socialism” (p68). 

This, however, seems obviously impossible. 

After all, we have evolved to seek to maximize the representation of our own genes in subsequent generations at the expense of those of other individuals. Only a eugenic reengineering of human nature itself could ever change this. 

Thus, as Donald Symons emphasized in his seminal The Evolution of Human Sexuality (which I have reviewed here), reproductive competition is inevitable – because, whereas there is sometimes sufficient food that everyone is satiated and competition for food is therefore unnecessary and counterproductive, reproductive success is always relative, and therefore competition over women is universal. 

Thus, Betzig quotes Confucius as observing:

Disorder does not come from heaven, but is brought about by women” (p26). 

Indeed, Betzig herself elsewhere recognizes this key point, namely the relativity of reproductive success, when she observes, in a passage quoted above, that a powerful monarch benefits from sequestering huge numbers of fertile females in his harem because, even if it is unfeasible that he would ever successfully impregnate all of them himself, he nevertheless thereby prevents other males from impregnating them, and thereby increases the relative representation of his own genes in subsequent generations (p70). 

It therefore seems inconceivable that social engineers, let alone pure happenstance, could ever engineer a society in which individual interests were identical to societal interests, other than a society of identical twins or through the eugenic reingineering of human nature itself (see Peter Singer’s A Darwinian Left, which I have reviewed here).[6]

Marx and the Means of Reproduction

The third and perhaps most important conflict between the Darwinist and Marxist perspectives concerns what Betzig terms: 

The relative emphasis on production and reproduction” (p67).

Whereas Marxists view control of what they term the means of production as the ultimate cause of societal conflict, socioeconomic status and exploitation, for Darwinians conflict and exploitation instead focus on control over what we might term the means of reproduction – in other words fertile females, their wombs, ova and vaginas. 

Thus, Betzig observes: 

Marxism makes no explicit prediction that exploitation should coincide with reproduction” (p68). 

In other words, Marxist theory is silent on the crucial issue of whether high-status individuals will necessarily convert their political and economic power into the ultimate currency of Darwinian selection – namely, reproductive success

On this view, powerful male rulers might just as well be celibate as control and assert exclusive reproductive access to large harems of young fertile wives and concubines. 

In contrast, for Darwinians, the effort to maximize one’s reproductive success is the very purpose, and ultimate end, of all political power. 

As sociologist-turned-sociobiologist Pierre van den Berghe observes in his excellent The Ethnic Phenomenon (reviewed here): 

The ultimate measure of human success is no production but reproduction. Economic productivity and profit are means to reproductive ends, not ends in themselves” (The Ethnic Phenomenon: p165). 

Thus, production is, from a sociobiological perspective, just another means of gaining the resources necessary for reproduction. 

On the other hand, reproduction is, from a biological perspective, the ultimate purpose of life. 

Therefore, it seems that, for all his ostensible radicalism, Karl Marx was, in his emphasis on economics rather than sex, just another nineteenth-century Victorian sexual prude

The Polygyny Threshold Model Applied to Humans? 

One way of conceptualizing the tendency of powerful males to attract (or perhaps commandeer) multiple wives and concubines is the polygyny threshold model

This way of conceptualizing male and female reproductive and ecological competition was first formulated by ornithologist-ecologist Gordon Orians in order to model the mating systems of passerine birds (Orians 1969). 

Here, males practice so-called resource defence polygyny – in other words, they defend territories containing valuable resources (e.g. food, nesting sites) necessary for successful reproduction and provisioning of offspring. 

Females then distribute themselves between males in accordance with size and quality of male territories. 

On this view, if the territory of one male is twice as resource-abundant as that of another, he would, all else being equal, attract twice as many mates; if it is three times as resource-abundant, he would attract three times as many mates; etc. 

The result is rough parity in resource-holdings and reproductive success among females, but often large disparities among males. 

Applying the Polygyny Threshold Model to Modern America

Thus, applying the polygyny threshold model to humans, and rather simplistically substituting wealth for territory size and quality, we might predict that, if Jeff Bezos is a hundred thousand times richer than Joe Schmo, then, if Joe has only one wife, then Jeff should have around 100,000 wives.

But, of course, Jeff Bezos does not have 100,000 wives, nor even a mere 100,000 concubines. 

Instead, he has only one solitary meagre ex-wife, and she, even when married to him, was not, to the best of my knowledge, ever guarded by any eunuchs – though perhaps he would have been better off if she had been, since they might have prevented her from divorcing him and taking an enormous share of his wealth with her in the ensuing divorce settlement.[7]

Indeed, with the sole exception of the magnificent John McAfee, founder of the first commercially available antivirus software, who, after making his millions, moved to a developing country where he obtained for himself a harem of teenage concubines, with whom he allegedly never actually had sex, instead preferring to have them defecate into his mouth while sitting in a hammock, but with whom he is nevertheless reported to have somehow fathered some forty-seven children, most modern millionaires, and billionaires, despite their immense wealth and the reproductive opportunities it offers, seemingly live lives of stultifyingly bland bourgeois respectability.

The same is also true of contemporary political leaders. 

Indeed, if any contemporary western political leader does attempt to practice polygyny, even on a comparatively modest scale, then, if discovered, a so-called sex scandal almost invariably results. 

Yet, viewed in historical perspective, the much-publicized marital infidelities of, say, Bill Clinton, though they may have outraged the sensibilities of the mass of monogamously-married Middle American morons, positively pale into insignificance besides the reproductive achievements of someone like, say, Ismail the Bloodthirsty

Indeed, Clinton’s infidelities don’t even pack much of a punch beside those of a politician from the same nation and just a generation removed, namely John F Kennedy – whose achievements in the political sphere are vastly overrated on account of his early death, but whose achievements in the bedroom, while scarcely matching those of Ismail the Bloodthirsty or the Aztec emperors, certainly put the current generation of American politicians to shame. 

Why, then, does the contemporary west represent such a glaring exception to the general pattern of elite polygyny that Betzig has so successfully documented throughout so much of the rest of the world, and throughout so much of history? And what has become of the henpecked geldings who pass for politicians in the contemporary era? 

Monogamy as Male Compromise? 

According to Betzig, the moronic mass media moral panic that invariably accompanies sexual indiscretions on the part of contemporary Western political leaders and other public figures is no accident. Rather, it is exactly what her theory predicts. 

According to Betzig, the institution of monogamy as it operates in Western democracies represents a compromise between low-status and high status males. 

According to the terms of this compromise, high-status males agree to forgo polygyny in exchange for the cooperation of low status males in participating in the complexly interdependent economic systems of modern western polities (p105) – or, in biologist Richard Alexander’s alternative formulation, in exchange for serving as necessary cannon-fodder in wars (p104).[8]

Thus, whereas, under polygyny, there are never enough females to go around, under monogamy, at least assuming that there is a roughly equal sex ratio (i.e. a roughly equal numbers of men and women), then virtually almost all males are capable of attracting a wife, howsoever physically repugnant, ugly and just plain unpleasant

This is important, since it means that all men, even the relatively poor and powerless, nevertheless have a reproductive stake in society. This, then, in evolutionary terms, provides them with an incentive both:

1) To participate in the economy to support and thereby provide for their wife and family; and

2) To defend these institutions in wartime, if necessary with their lives.

The institution of monogamy has therefore been viewed as a key factor, if not the key factor, in both the economic and military ascendency of the West (see Scheidel 2008). 

Similarly, it has recently been argued that the increasing rates of non-participation of young males in the economy and workforce (i.e. the so-called NEET’ phenomenon) is a direct consequence of the reduction in reproductive opportunities to young males (Binder 2021).[9]

Thus, on this view, then, the media scandal and hysteria that invariably accompanies sexual infidelities by elected politicians, or constitutional monarchs, reflects outrage that the terms of this implicit agreement have been breached. 

This idea was anticipated by Irish playwright and socialist George Bernard Shaw, who observed in Man and Superman: Maxims for Revolutionaries, the preface to his play Man and Superman

Polygyny, when tried under modern democratic conditions, as by the Mormons is wrecked by the revolt of the mass of inferior men who are condemned to celibacy by it” (Shaw 1903). 

Socially Imposed Monogamy’?

Consistent with this theory of socially imposed monogamy, it is indeed the case that, in all Western democratic polities, polygyny is unlawful, and bigamy a crime. 

Yet these laws are seemingly in conflict with contemporary western liberal democratic principles of tolerance and inclusivity, especially in respect of ‘alternative lifestyles’ and ‘non-traditional relationships’.

Thus, for example, we have recently witnessed a successful campaign for the legalization of gay marriage in most western jurisdictions. However, strangely, polygynous marriage seemingly remains anathema – despite the fact that most cultures across the world and throughout history have permitted polygynous marriage, whereas few if any have ever accorded any state recognition to homosexual unions.

Indeed, strangely, whereas the legalization of gay marriage was widely perceived as ‘progressive’, polygyny is associated, not with sexual liberation with rather with highly traditional and sexually repressive groups such as Mormons and Muslims.[10]

Polygynous marriage was also, rather strangely, associated with the supposed oppression of women in traditional societies such as under Islam

However, most women actually do better, at least in purely economic terms, under polygyny than under monogamy, at least in highly stratified societies with large differences in resource-holdings as between males. 

Thus, if, as we have seen, Jeff Bezos is 100,000 times richer than Joe Schmo, then a woman is financially better off becoming the second wife, or the tenth wife (or even the 99,999th wife!), of Jeff Bezos rather than the first wife of poor Joe. 

Moreover, women also have another incentive to prefer Jeff to Joe. 

If she is impregnated by a polygynous male like Jeff, then her male descendants may inherit the traits that facilitated their father’s wealth, power and polygyny, and hence become similarly reproductively successful themselves, aiding the spread of the woman’s own genes in subsequent generations. 

Biologists call this good genes sexual selection or, more catchily, the sexy son hypothesis

Once again, however, George Bernard Shaw beat them to it when he observed in the same 1903 essay quoted above: 

Maternal instinct leads a woman to prefer a tenth share in a first rate man to the exclusive possession of a third rate one” (Shaw 1903). 

Thus, Robert Wright concludes: 

In sheerly Darwinian terms, most men are probably better off in a monogamous system, and most women worse off” (The Moral Animal: p96). 

Thus, women generally should welcome polygyny, while the only people opposed to polygyny should be: 

1) The women currently married to men like Jeff Bezos, and greedily unwilling to share their resource-abundant ‘alpha-male’ providers with a whole hundred-fold harem of co-wives and concubines; and

2) A glut of horny sexually-frustrated bachelor-‘incels’ terminally condemned to celibacy, bachelorhood and inceldom by promiscuous lotharios like Jeff Bezos and Ismail the Bloodthirsty greedily hogging all the hot chicks for themselves.

Who Opposes Polygyny, and Why? 

However, in my experience, the people who most vociferously and puritanically object to philandering male politicians are not low-status men, but rather women. 

Moreover, such women typically affect concern on behalf, not of the male bachelors and ‘incels’ supposedly indirectly condemned to celibacy by such behaviours, but rather the wives of such politicians – though the latter are the chief beneficiaries of monogamy, while these other women, precluded from signing up as second or third-wives to alpha-male providers, are themselves, at least in theory, among the main losers. 

This suggests that the ‘male compromise theory’ of socially-imposed monogamy is not the whole story. 

Perhaps then, although women benefit in purely financial terms under polygyny, they do not do so well in fitness terms. 

Thus, one study found that, whereas polygynous males (unsurprisingly) had more offspring than monogamously-mated males, they (perhaps also unsurprisingly) had fewer offspring per wife. This suggests that, while polygynously-married males benefit from polygyny, their wives incur a fitness penalty for having to share their husband (Strassman 2000). 

This probably reflects the fact that even male reproductive capacity is limited, as, notwithstanding the Coolidge effect (which has, to my knowledge, yet to be demonstrated in humans), males can only manage a certain number of orgasms per day. 

Women’s distaste for polygynous unions may also reflect the fact that even prodigiously wealthy males will inevitably have a limited supply of one particular resource – namely, time – and time spent with offspring by a loving biological father may be an important determinant of offspring success, which paid child-minders, and stepfathers, lacking a direct genetic stake in offspring, are unable to perfectly replicate.[11]

Thus, if Jeff Bezos were able to attract for himself the 100,000 wives that the polygyny threshold model suggests is his due, then, even if he were capable of providing each woman with the two point four children that is her own due, it is doubtful he would have enough time on his hands to spend much ‘quality time’ with each of his 240,000 offspring – just as one doubts Ismail the Bloodthirsty was himself an attentive father his own more modest mere 888. 

Thus, one suspects that, contrary to the polygyny threshold model, polygyny is not always entirely a matter of female choice (Sanderson 2001).

On the contrary, many of the women sequestered into the harems of rulers like Ismail the Bloodthirsty likely had little say in the matter. 

The Central Theoretical Problem of Human Sociobiology’ 

Yet, if this goes some way towards explaining the apparent paradox of socially imposed monogamy, there is, today, an even greater paradox with which we must wrestle – namely, why, in contemporary western societies, is there apparently an inverse correlation between wealth and number of offspring.

After all, from a sociobiological or evolutionary psychological perspective, this represents something of a paradox. 

If, as we have seen, the very purpose of wealth and power (from a sociobiological perspective) is to convert these advantages into the ultimately currency of natural selection, namely reproductive success, then why are the wealthy so spectacularly failing to do so in the contemporary west?[12]

Moreover, if status is not conducive to high reproductive success, then why have humans evolved to seek high-status in the first place? 

This anomaly has been memorably termed the ‘The central theoretical problem of human sociobiology’ in a paper by University of Pennsylvania demographer and eugenicist Daniel Vining (Vining 1986). 

Socially imposed monogamy can only go some way towards explaining this anomaly. Thus, in previous centuries, even under monogamy, wealthier families still produced more surviving offspring, if only because their greater wealth enabled them to successfully rear and feed multiple successive offspring to adulthood. In contrast, for the poor, high rates of infant mortality were the order of the day. 

Yet, in the contemporary west, it seems that the people who have the most children and hence the highest fitness in the strict Darwinian sense, are, at least according to popular stereotype, single mothers on government welfare. 

De Facto’ Polygyny 

Various solutions have been proposed to this apparent paradox. A couple amount to claiming that the west is not really monogamous at all, and, once this is factored in, then, at least among males, higher-status men do indeed have greater numbers of offspring than lower-status men. 

One suggestion along these lines is that perhaps wealthy males sire additional offspring whose paternity is misassigned, via extra-marital liaisons (Betzig 1993b). 

However, despite some sensationalized claims, rates of misassigned paternity are actually quite low (Khan 2010; Gilding 2005; Bellis et al 2005). 

If it is lower-class women who are giving birth to most of the offspring, then it is probably mostly males of their own socioeconomic status who are responsible for impregnating them, if only because it is the latter with whom they have the most social contact. 

Perhaps a more plausible suggestion is that wealthy high-status males are able to practice a form of disguised polygyny by through repeated remarriage. 

Thus, wealthy men are sometimes criticized for divorcing their first wives to marry much younger second- and sometimes even third- and fourth-wives. In this way, they manage monopolize the peak reproductive years of multiple successive young women. 

This is true, for example, of recent American President Donald Trump – the ultimate American alpha male – who has himself married three women, each one younger than her predecessor

Thus, science journalist Robert Wright contends: 

The United States is no longer a nation of institutionalized monogamy. It is a nation of serial monogamy. And serial monogamy in some ways amounts to polygyny.” (The Moral Animal: p101). 

This, then, is not so much ‘serial monogamy’ as it is ‘sequential’ or non-concurrent polygyny’. 

Evolutionary Novelties

Another suggestion is that evolutionary novelties – i.e. recently developed technologies such as contraception – have disrupted the usual association between status and fertility. 

On this view, natural selection has simply not yet had sufficient time (or, rather, sufficient generations) over which to mold our psychology and behaviour in such a way as to cause us to use these technologies in an adaptive manner – i.e. in order to maximize, not restrict, our reproductive success. 

An obvious candidate here is safe and effective contraception, which, while actually somewhat older than most people imagine, nevertheless became widely available to the population at large only over the course of the past century, which is surely not enough generations for us to have become evolutionarily adapted to its use.  

Thus, a couple of studies have found that that, while wealthy high-status males may not father more offspring, they do have more sex with a greater number of partners – i.e. behaviours that would have resulted in more offspring in ancestral environments prior to the widespread availability of contraception (Pérusse 1993: Kanazawa 2003). 

This implies that high-status males (or their partners) use contraception either more often, or more effectively, than low-status males (or their partners), probably because of their greater intelligence and self-control, namely the very traits that enabled them to achieve high socioeconomic status in the first place (Kanazawa 2005). 

Another evolutionary novelty that may disrupt the usual association between social status and number of surviving offspring is the welfare system

Welfare payments to single mothers undoubtedly help these families raise to adulthood offspring who would otherwise perish in infancy. 

In addition, by reducing the financial disincentives associated with raising additional offspring, they probably increase the number of offspring these women choose to have in the first place. 

While it is highly controversial to suggest that welfare payments to single mothers actually give the latter an actual financial incentive to bear additional offspring, they surely, at the very least, reduce the financial disincentives otherwise associated with bearing additional children. 

Therefore, given that the desire for offspring is probably innate, women would rationally respond by having more children.[13]

Feminist ideology also encourages women in particular to postpone childbearing in favour of careers. Moreover, it is probably higher-status females who are more exposed to feminist ideology, especially in universities, where feminist ideology is thoroughly entrenched and widely proselytized

In contrast, lower-status women are not only less exposed to feminist ideology encouraging them to delay motherhood in favour of career, but also likely have fewer appealing careers available to them in the first place. 

Finally, even laws against bigamy and polygyny might be conceptualized as an evolutionary novelty that disrupts the usual association between status and fertility. 

However, whereas technological innovations such as effective contraception were certainly not available until recent times, ideological constructs and religious teachings – including ideas such as feminism, prohibitions on polygyny, and the socialist ideology that motivated the creation of the welfare state – have existed ever since we evolved the capacity to create such constructs (i.e. since we became fully human). 

Therefore, one would expect that humans would have evolved resistance to ideological and religious teachings that go against their genetic interests. Otherwise, we would be vulnerable to indoctrination (and hence exploitation) at the hands third parties. 

Dysgenics? 

Finally, it must be noted that these issues are not only of purely academic interest. 

On the contrary, since socioeconomic status correlates with both intelligence and personality traits such as conscientiousness, and these traits are, in turn, substantially heritable, and moreover determine, not only individual wealth and prosperity, but also at the aggregate level, the wealth and prosperity of nations, the question of who has the offspring is surely of central concern to the future of society, civilization and the world. 

In short, what is at stake is the very genetic posterity that we bequeath to future generations. It is simply too important a matter to be delegated to the capricious and irrational decision-making of individual women. 

__________________________

Endnotes

[1] Actually, the precise number of offspring Ismail fathered is unclear. The figure I have quoted in the main body of the text comes from various works on evolutionary psychology (e.g. Cartwright, Evolution and Human Behaviour: p133-4; Wright, The Moral Animal: p247). However, another earlier work on human sociobiology, David Barash’s The Whisperings Within gives an even higher figure, of “1,056 offspring” (The Whisperings Within: p47). Meanwhile, an article produced by the Guinness Book of Records gives an even higher figure of at least 342 daughters and 700 sons, while a scientific paper by Elisabeth Oberzaucher and Karl Grammer gives a figure of 1171 offspring in total. The precise figure seems to be unknown and is probably apocryphal. Nevertheless, the general point – namely that a powerful male with access to a large harem and multiple wives and concubines, is capable of fathering many offspring – is surely correct.

[2] Thus, it is important to emphasise that sexual abuse allegations should certainly not automatically be accepted as credible, given the prevalence of false rape allegations, and indeed their incentivization, especially in this age of me too’ hysteria and associated witch-hunts. Indeed, western mainstream media is likely to be especially credulous respect to allegations in respect of a dictator which it and the political establishment it serves had long reviled and demonized.
Moreover, although, as noted above, given the innate psychological and physiological differences between the sexes, women are unlikely to be effective as conventional bodyguards any more than they are effective as soldiers in wartime, it has nevertheless been suggested that they may have provided a very different form of protection the Libyan dictator – namely as a highly effective ‘human shield’.
On this view, under the pretence of feminism, Gaddaffi may actually have been shrewdly taking advantage of misguided male chivalry and female privilege, not unreasonably surmising that any potential assassins and unsurgents would almost certainly be male, and hence chivalrous, paternalistic and protective towards women, especially since these assassins are also likely to be conservative Muslims, who formed the main bulk of the domestic opposition to his regime, and the deliberate killing of women is explicitly forbidden under Islamic law (Sahih Muslim 19: 4320; cf. Sihah Muslim 19: 4321).

[3] The capture of fertile females from among enemy groups is by no means restricted to the Yąnomamö. On the contrary, it may even form the ultimate evolutionary basis for intergroup conflict and raiding among troops of chimpanzees, our species’ closest extant relative. It is also alluded to, and indeed explicitly commanded, in the Hebrew Bible (e.g. Deuteronomy 20: 13-14; Numbers 31: 17-18), and was formerly prevalent in western culture as well.
It is also very much apparent, for example, in the warfare and raiding formerly endemic in the Gobi Desert of what is today Mongolia. Thus, the mother of Genghis Khan was, at least according to legend, herself kidnapped by the Great Khan’s father. Indeed, this was apparently an accepted form of courtship on the Mongolian Steppe, as Genghis Khan’s own wife was herself stolen from him on at least one occasion by rival Steppe nomads, resulting in a son of disputed paternity (whom the great Khan perhaps tellingly named Jochi, which is said to translate as ‘guest) and a later succession crisis.
Many anthropologists, it ought to be noted, dismiss Chagnon’s claim that Yanomami warfare is predicated on the capture of women. Perhaps the most famous is Chagnon’s own former student, Kenneth Good, whose main claim to fame is to have himself married a (by American standards, underage) Yąnomamö girl – who, in a dramatic falsification of her husband’s theory that would almost be amusing were it not so tragic, was then herself twice abducted and raped by raiding Yanomami war parties.

[4] It is ironic that John Cartwright, author of Evolution and Human Behaviour, an undergraduate level textbook on evolutionary psychology, is skeptical regarding the claim that Ismail the Bloodthirsty fathered 888 offspring, but nevertheless apparently takes at face value that claim that a Russian peasant woman had 69 offspring, a biologically far more implausible claim (Evolution and Human Behaviour: p133-4).

[5] However, here, Betzig is perhaps altogether overcautious. Thus, whether or not “political power in itself” is explained in this way (i.e. “as providing a position from which to gain reproductively”), certainly the human desire for political power must surely be explained in this way.

[6] The prospect of eugenically reengineering human nature itself so as to make utopian communism achievable, and human society less conflictual, is also unrealistic. As John Gray has noted in Straw Dogs: Thoughts on Humans and Other Animals (reviewed here), if human nature is eugenically reengineered, then it will be done, not in the interests of society, let alone humankind, as a whole, but rather in the interests of those responsible for ordering or undertaking the project – namely, scientists and, more importantly, those from whom they take their orders (e.g. government, politicians, civil servants, big business, managerial elites). Thus, Gray concludes:

“[Although] it seems feasible that over the coming century human nature will be scientifically remodelled… it will be done haphazardly, as an upshot of struggles in the murky realm where big business, organized crime and the hidden parts of government vie for control” (Straw Dogs: p6).

[7] Here, it is important to emphasize that what is exceptional about western societies is not monogamy per se. On the contrary, monogamy is common in relatively egalitarian societies (e.g. hunter-gatherer societies), especially those living at or near subsistence levels, where no male is able to secure access to sufficient resources so as to provision multiple wives and offspring (Kanazawa and Still 1999). What is exceptional about contemporary western societies is the combination of:

1) Large differentials of resource-holdings between males (i.e. social stratification); and

2) Prescriptive monogamy (i.e. polygyny is not merely not widely practised, but also actually unlawful).

[8] Quite when a degree of de facto monogamy originated in the west seems to be a matter of some dispute. Betzig views it as very much a recent phenomenon, arising with the development of complex, interdependent industrial economies, which required the cooperation of lower-status males in order to function. Here, Betzig perhaps underestimates the extent to which even pre-industrial economies required the work and cooperation of low-status males in order to function.
Thus, Betzig argues that, in ancient Rome, nominally monogamous marriages concealed rampantly de facto polygyny, with emperors and other powerful males fathering multiple offspring with both slaves and other men’s wives (Betzig 1992). As evidence, she largely relies on salacious gossip about a few eminent Roman political leades.
Similarly, in medieval Europe, she argues that, despite nominal monogamy, wealthy men fathered multiple offspring through servant girls (Betzig 1995a; Betzig 1995b). In contrast, Kevin Macdonald persuasively contends that medieval monogamy was no mere myth and most illegitimate offspring born to servant girls were fathered by men of roughly their own station (Macdonald 1995a; Macdonald 1995b).

[9] Certainly, the so-called NEET and incel phenomena seem to be correlated with one another. NEETs are disproportionately likely to be incels, and incels are disproportionately likely to be NEETs. However, the direction of causation is unclear and probably works in both directions.
On the one hand, since women are rarely attracted to men without money or the prospects of money, men without jobs are rarely able to attract wives or girlfriends. However, on the other hand, men who, for whatever reason, perceive themselves as unable to attract a wife or girlfriend even if they did have a job, may see little incentive to getting a job in the first place or keeping the one they do have.
In addition, certain aspects of personality, and indeed psychopathology, likely predispose a man both to joblessness and inability to obtain a wife or girlfriend. These include mental illness, mental and physical disabilities, and conditions such as autism.
Finally, the NEET phenomenon cannot be explained solely by the supposed decline in marriage opportunities for young men, as might be suggested by simplistic reading of Binder (2021). Another factor is surely the increased affluence of society at large. In previous times, and in much of the developing world today, remaining voluntarily would likely result in penury and destitution for all but a tiny minority of the economic elite.

[10] Indeed, during the debates surrounding the legalization of gay marriage, the prospect of the legalization of polygynous marriage was rarely discussed, and, when it was raised, it was usually invoked by the opponents of gay marriage, as a sort of reductio ad absurdum of changes in marriage laws to permit gay marriage, something champions of gay marriage were quick to dismiss as preposterous scaremongering. In short, both sides in the acrimonious debates regarding gay marriage seem to have been agreed that legalizing polygynous unions was utterly beyond the pale.

[11] Thus, father absence is a known correlate of criminality and other negative life outcomes. In fact, however, the importance of paternal investment in offspring outcomes, and indeed of parental influence more generally, has yet to be demonstrated, since the correlation between father-absence and negative life-outcomes could instead reflect the heritability of personality, including those aspects of personality that cause people to have offspring out of wedlock, die early, divorce, abandon their children or have offspring by a person who abandons their offspring or dies early (see Judith Harris’s The Nurture Assumption, which I have reviewed here). 

[12] This paradox is related to another one – namely, why it is that people in richer societies tend to have lower fertility rates than poorer societies? This recent development, often referred to as the demographic transition, is paradoxical for the exact same reason that it is paradoxical for relatively wealthier people within western societies to have have fewer offspring than relatively poorer people within these same societies, namely that it is elementary Darwinism 101 that an organism with access to greater resources should channel those additional resources into increased reproduction. Interestingly, this phenomenon is not restricted to western societies. On the contrary, other wealthy industrial and post-industrial societies, such as Japan, Singapore and South Korea, have, if anything, even lower fertility rates than Europe, Australasia and North America.

[13] Actually, it is not altogether clear that women do have an innate desire to bear children. After all, in the EEA, there was no need for women to evolve a desire to bear children. All they required to a desire to have sexual intercourse (or indeed a mere willingness to acquiesce in the male desire for intercourse). In the absence of contraception, offspring would then naturally result. Indeed, other species, including presumably most of our pre-human ancestors, are surely wholly unaware of the connection between sexual intercourse and reproduction. A desire for offspring would then serve no adaptive function for these species at all. However, this did not stop these species from seeking out sexual opportunities and hence reproducing their kind. However, given anecdotal evidence of so-called ‘broodiness’ among women, I suspect women do indeed have some degree of innate desire for offspring.

References

Bateman (1948), Intra-sexual selection in Drosophila, Heredity, 2 (Pt. 3): 349–368.
Bellis et al (2005) Measuring Paternal Discrepancy and its Public Health Consequences. Journal of Epidemiology and Community Health 59(9):749.
Betzig 1992 Roman Polygyny. Ethology and Sociobiology 13(5-6): 309-349.
Betzig 1993a. Sex, succession, and stratification in the first six civilizations: How powerful men reproduced, passed power on to their sons, and used power to defend their wealth, women and children. In Lee Ellis, ed. Social Stratification and Socioeconomic Inequality, pp. 37-74. New York: Praeger.
Betzig 1993b. Where are the bastards’ daddies? Comment on Daniel Pérusse’s ‘Cultural and reproductive success in industrial societies’. Behavioral and Brain Sciences, 16: 284-85.
Betzig 1995a Medieval Monogamy. Journal of Family History 20(2): 181-216.
Betzig 1995b Wanting Women Isn’t New; Getting Them Is: Very. Politics and the Life Sciences 14(1): 24-25.
Binder (2021) Why Bother? The Effect of Declining Marriage Market Prospects on Labor-Force Participation by Young Men (March 1, 2021). Available at SSRN: https://ssrn.com/abstract=3795585 or http://dx.doi.org/10.2139/ssrn.3795585
Chagnon N (1979) Is reproductive success equal in egalitarian societies. In: Chagnon & Irons (eds) Evolutionary Biology and Human Social Behavior: An Anthropological Perspective pp.374-402 (MA: Duxbury Press).
Einon, G (1998) How Many Children Can One Man Have? Evolution and Human Behavior, 19(6):413–426.
Gilding (2005) Rampant Misattributed Paternity: The Creation of an Urban Myth. People and Place 13(2): 1.
Gould (2000) How many children could Moulay Ismail have had? Evolution and Human Behavior 21(4): 295 – 296.
Khan (2010) The paternity myth: The rarity of cuckoldry, Discover, 20 June, 2010.
Kanazawa & Still (1999) Why Monogamy? Social Forces 78(1):25-50.
Kanazawa (2003) Can Evolutionary Psychology Explain Reproductive Behavior in the Contemporary United States? Sociological Quarterly. 44: 291–302.
Kanazawa (2005) An Empirical Test of a Possible Solution to ‘the Central Theoretical Problem of Human Sociobiology’. Journal of Cultural and Evolutionary Psychology. 3: 255–266.
Macdonald 1995a The establishment and maintenance of socially imposed monogamy in Western Europe, Politics and the Life Sciences, 14(1): 3-23.
Macdonald 1995b Focusing on the group: further issues related to western monogamy, Politics and the Life Sciences, 14(1): 38-46.
Oberzaucher & Grammer (2014) The Case of Moulay Ismael – Fact or Fancy? PLoS ONE 9(2): e85292.
Orians (1969) On the Evolution of Mating Systems in Birds and Mammals. American Naturalist 103 (934): 589–603.
Packer et al (1995) Reproductive constraints on aggressive competition in female baboons. Nature 373: 60–63.
Pérusse (1993). Cultural and Reproductive Success in Industrial Societies: Testing the Relationship at the Proximate and Ultimate Levels.” Behavioral and Brain Sciences 16:267–322.
Sanderson (2001) Explaining Monogamy and Polygyny in Human Societies: Comment on Kanazawa and Still. Social Forces 80(1):329-335.
Scheidel (2008) Monogamy and Polygyny in Greece, Rome, and World History, (June 2008). Available at SSRN: https://ssrn.com/abstract=1214729 or http://dx.doi.org/10.2139/ssrn.1214729
Shaw GB (1903) Man and Superman, Maxims for Revolutionists.
Strassman B (2000) Polygyny, Family Structure and Infant Mortality: A Prospective Study Among the Dogon of Mali. In Cronk, Chagnon & Irons (Ed.), Adaptation and Human Behavior: An Anthropological Perspective (pp.49-68). New York: Aldine de Gruyter.
Trivers, R. (1972). Parental investment and sexual selection. Sexual Selection & the Descent of Man, Aldine de Gruyter, New York, 136-179. Chicago.
Vining D 1986 Social versus reproductive success: The central theoretical problem of human sociobiology Behavioral and Brain Sciences 9(1): 167- 187.
Zerjal et al. (2003) The Genetic Legacy of the Mongols, American Journal of Human Genetics, 72(3): 717–721.

Donald Symons’ ‘The Evolution of Human Sexuality’: A Founding Work of Modern Evolutionary Psychology

The Evolution of Human Sexuality by Donald Symons (Oxford University Press 1980). 

Research over the last four decades in the field that has come to be known as evolutionary psychology has focused disproportionately on mating behaviour. Geoffrey Miller (1998) has even argued that it is the theory of sexual selection rather than that of natural selection which, in practice, guides most research in this field. 

This does not reflect merely the prurience of researchers. Rather, given that reproductive success is the ultimate currency of natural selection, mating behaviour is, perhaps along with parental investment, the form of behaviour most directly subject to selective pressures.

Almost all of this research traces its ancestry ultimately to Donald Symons’ ‘The Evolution of Human Sexuality’ by Donald Symons. Indeed, much of it was explicitly designed to test claims and predictions formulated by Symons himself in this very book.

Age Preferences

For example, in his discussion of the age at which women are perceived as most attractive by males, Symons formulated two alternative hypotheses. 

First, if human evolutionary history were characterized by fleeting one-off sexual encounters (i.e. one-night standscasual sex and hook-ups), then, he reasoned, men would have evolved to find women most attractive when the latter are at the age of their maximum fertility

For women, fertility is said to peak around when a woman reaches her mid-twenties since, although women still in their teens have high pregnancy rates, they also experience greater risk of birth complications

However, if human evolutionary history were characterized instead by long-term pair bonds, then men would have evolved to be maximally attracted to somewhat younger women (i.e. those at the beginning of their reproductive careers), so that, by entering a long-term relationship with the woman at this time, a male is potentially able to monopolize her entire lifetime reproductive output (p189). 

More specifically, males would have evolved to prefer females, not of maximal fertility, but rather of maximal reproductive value, a term borrowed from demography and population genetics which refers to a person’s expected future reproductive output given their current age. Unlike fertility, a woman’s reproductive value peaks around her mid- to late-teens.  

On the basis of largely anecdotal evidence, Symons concludes that human males have evolved to be most attracted to females of maximal reproductive value rather than maximal fertility.  

Subsequent research designed to test between Symons’s rival hypotheses has largely confirmed his speculative hunch that it is younger females in their mid- to late-teens who are perceived by males as most attractive (e.g. Kenrick and Keefe 1992). 

Why Average is Attractive

Symons is also credited as the first person to recognize that a major criterion of attractiveness is, paradoxically, averageness, or at least the first to recognize the significance of, and possible evolutionary explanation for, this discovery.[1] Thus, Symons argues that: 

“[Although] health and status are unusual in that there is no such thing as being too healthy or too high ranking… with respect to most anatomical traits, natural selection produces the population mean” (p194). 

On this view, deviations from the population mean are interpreted as the result of deleterious mutations or developmental instability, and hence bad genes.[2]

Concealed Ovulation

Support has even emerged for some of Symons’ more speculative hunches.

For example, one of Symons’ two proposed scenarios for the evolution of concealed ovulation, in which he professed “little confidence” (p141), was that this had evolved so as to impede male mate-guarding and enable females select a biological father for their offspring different from their husbands (p139-141).

Consistent with this theory, studies have found that women’s mate preferences vary throughout their menstrual cycle in a manner compatible with a so-called ‘dual mating strategy’, preferring males evidencing a willingness to invest in offspring at most times, but, when at their most fertile, preferring characteristics indicative of genetic quality (e.g. Penton-Voak et al 1999). 

Meanwhile, a questionnaire distributed via a women’s magazine found that women engaged in extra-marital affairs do indeed report engaging in ‘extra-pair copulations’ (EPCs) at times likely to coincide with ovulation (Bellis and Baker 1990).[3]

The Myth of Female Choice

Interestingly, Symons even anticipated some of the mistakes evolutionary psychologists would be led into.

Thus, he warns that researchers in modern western societies may be prone to overestimate the importance of female choice as a factor in human evolution, because, in their own societies, this is a major factor, if not the major factor, in determining marriage and sexual and romantic relationships (p203).[4]

However, in ancestral environments (i.e. what evolutionary psychologists now call the Environment of Evolutionary Adaptedness or EEA) arranged marriages were likely the norm, as they are in most premodern cultures around the world today (p168).[5]

Thus, Symons concludes: 

There is no evidence that any features of human anatomy were produced by intersexual selection [i.e. female choice]. Human physical sex differences are explained most parsimoniously as the outcome of intrasexual selection (the result of male-male competition)” (p203). 

Thus, human males have no obvious analogue of the peacock’s tail, but they do have substantially greater levels of upper-body strength and violent aggression as compared to females.[6]

This was a warning almost entirely ignored by subsequent generations of researchers before being forcefully reiterated by Puts (2010)

Homosexuality as a ‘Test-Case

An idea of the importance of Symons’s work can be ascertained by comparing it with contemporaneous works addressing the same subject-matter.

Edward O Wilson’s On Human Nature was first published in 1978, only a year before Symons’s ‘The Evolution of Human Sexuality’. 

However, whereas Symons’s book set out much of the theoretical basis for what would become the modern science of evolutionary psychology, Wilson’s chapter on “Sex” has dated rather less well, and a large portion of chapter is devoted to introducing a now faintly embarrassing theory of the evolution of homosexuality which has subsequently received no empirical support (see Bobrow & Bailey 2001).[7]

In contrast, Symons’s own treatment of homosexuality is innovative. It is also characteristic of his whole approach and illustrates why ‘The Evolution of Human Sexuality‘ has been described by David Buss as “the first major treatise on evolutionary psychology proper” (Handbook of Evolutionary Psychology: p251).

Rather than viewing all behaviours as necessarily adaptive (as critics of evolutionary psychology, such as Stephen Jay Gould, have often accused sociobiologists of doing),[8] Symons instead focuses on admittedly non-adaptive (or, indeed, even maladaptive) behaviours, not because he believes them to be adaptive, but rather because they provide a unique window on the nature of human sexuality.

Accordingly, Symons does not concern himself with how homosexuality evolved, implicitly viewing it as a rare and maladaptive malfunctioning of normal sexuality. Yet the behaviour of homosexuals is of interest to Symons because it provides a window on the nature of male and female sexuality as it manifests itself when freed from the constraints imposed by the conflicting desires of the opposite sex.

On this view, the rampant promiscuity manifested by many homosexual men (e.g. cruising and cottaging in bathhouses and public lavatories, or Grindr hookups) reflects the universal male desire for sexual variety when freed from the constraints imposed by the conflicting desires of women. 

This desire for sexual variety is, of course, obviously reproductively unproductive among homosexual men themselves. However, it evolved because it enhanced the reproductive success of heterosexual men by motivating them to attempt to mate with multiple females and thereby father multiple offspring.

Thus, a powerful ruler like with a large harem like Ismail the Bloodthirsty’ of Morocco could reputedly father as many as 888 offspring.

In contrast, burdened with pregnancy and lactation, women’s potential reproductive rate is more tightly constrained than that of men. They therefore have little to gain reproductively by mating with multiple males, since they can usually gestate, and nurse, only one offspring at a time.

It is therefore notable that, among lesbians, there is little evidence of the sort of rampant promiscuity common among gay men. Instead, lesbian relationships seem to be characterized by much the same features as heterosexual coupling (i.e. long-term pair-bonds).

The similarity of heterosexual coupling to that of lesbians, and the striking contrast with that of male homosexuals, suggests that it is women, not men, who exert decisive influence in dictating the terms of heterosexual coupling.[9]

Thus, Symons reports:

There is enormous cross-cultural variation in sexual customs and laws and the extent of male control, yet nowhere in the world do heterosexual relations begin to approximate those typical of homosexual men This suggests that, in addition to custom and law, heterosexual relations are structured to a substantial degree by the nature and interests of the human female” (p300). 

This conclusion is, of course, diametrically opposite to the feminist contention that it is men who dictate the terms of heterosexual coupling and for whose exclusive benefit such relationships are structured.

It also suggests, again contrary to feminist assumptions of male dominance, that most men are ultimately frustrated in achieving their sexual ambitions to a far greater extent than are most women. 

Thus, Symons concludes: 

The desire for sexual variety dooms most human males to a lifetime of unfulfilled longing” (p228). 

Here, Symons anticipates Camille Paglia who was later to famously observe: 

Men know they are sexual exiles. They wander the earth seeking satisfaction, craving and despising, never content. There is nothing in that anguished motion for women to envy” (Sexual Personae: p19). 

Criticisms of Symons’s Use of Homosexuality as a Test-Case

There is, however, a potential problem with Symons’s use of homosexual behaviour as a window onto the nature of male and female sexuality as they manifest themselves when freed from the conflicting desires of the opposite sex. The whole analysis rests on a questionable premise – namely that homosexuals are, their preference for same-sex partners aside, otherwise similar, if not identical, to heterosexuals of their own sex in their psychology and sexuality.

Symons defends this assumption, arguing: 

There is no reason to suppose that homosexuals differ systematically from heterosexuals in any way other than their sexual object choice” (p292). 

Indeed, in some respects, Symons seems to see even “sexual object choice” as analogous among homosexuals and heterosexuals of the same sex.

For example, he observes that, unlike women, both homosexual and heterosexual men tend to evaluate prospective mates primarily on the basis their physical appearance and youthfulness (p295). 

Thus, in contrast to the failure of periodicals featuring male nudes to attract a substantial female audience (see below), Symons notes the existence of a market for gay pornography parallel in most respects to heterosexual porn – i.e. featuring young, physically attractive models in various states of undress (p301).

This, of course, contradicts the feminist notion that men are led to ‘objectify’ women only due to the sexualized portrayal of the latter in the media.

Instead, Symons concludes: 

That homosexual men are at least as likely as heterosexual men to be interested in pornography, cosmetic qualities and youth seems to me to imply that these interests are no more the result of advertising than adultery and alcohol consumption are the result of country and western music” (p304).[10] 

However, this assumption of the fundamental similarity of heterosexual and homosexual male psychology has been challenged by David Buller in his book, Adapting Minds: Evolutionary Psychology and the Persistent Quest for Human Nature.

Buller cites evidence that male homosexuals are ‘feminized’ in many aspects of their behaviour and morphology.

For example, one study reported that, despite stereotypically more likely to ‘hit the gym’, gay man nevertheless had relatively less muscular development than heterosexual men, and lower shoulder-to-hip ratios on average (Evans 1972). Another particularly interesting recent study found that male homosexuals have more female-typical occupation interests than do heterosexual males (Ellis & Ratnasingam 2012).

Likewise, one of the few consistent early correlates of homosexuality is gender non-conformity in childhood and some evidence (e.g. digit ratios, the fraternal birth order effect) has been interpreted to suggest that the level of prenatal exposure to masculinizing androgens (e.g. testosterone) in utero affects sexual orientation (see Born Gay: The Pyschobiology of Sexual Orientation).

Indeed, Symons himself mentions the evidence of an association between homosexuality and levels of masculinizing androgens in utero (albeit in respect of lesbians rather than of male homosexuality) just a few pages before his discussion of the promiscuous behaviours of male homosexuals (p289).

As Buller also notes, although gay men seem, like heterosexual men, to prefer youthful sexual partners, they also appear to prefer sexual partners who are, in other respects highly masculine.[11]

Thus, Buller observes: 

“The males featured in gay men’s magazines embody very masculine, muscular physiques, not pseudo-feminine physiques” (Adapting Minds: p227).

Indeed, the models in such magazines seem in most respects similar in physical appearance to the male models, pop stars, actors and other ‘sex symbols’ and celebrities fantasized about by heterosexual women and girls.

How then are we to resolve this apparent paradox?

One possible explanation that some aspects of the psychology of male homosexuals are feminized but not others – perhaps because different parts of the brain are formed at different stages of prenatal development, at which stages the levels of masculinizing androgens in the womb may vary. 

Thus, Glenn Wilson, writing in 1989 and citing the work of Ellis & Ames (1987), reports that:

The masculinization/feminization effects occur in different parts of the brain and, more importantly, at different times during pre-natal development. Indications are that sex orientation in humans depends critically upon the hormone balance prevailing during the third and fourth months of pregnancy, while secondary sex characteristics and sex-typical behaviour patterns are influenced more by hormones circulating during the fifth and sixth months of pregnancy” (The Great Sex Divide: p79).

Indeed, there is even some evidence that homosexual males may be hyper-masculinized in some aspects of their physiology.

For example, it has been found that homosexual males report larger penis-sizes than heterosexual men (Bogaert & Hershberger 1999). 
 
Researchers Glenn Wilson and Qazi Rahman propose, may be because: 

If it is supposed that the barriers against androgens with respect to certain brain structures (notably those concerned with homosexuality) lead to increased secretion in an effort to break through, or some sort of accumulation elsewhere… then there may be excess testosterone left in other departments” (Born Gay: The Psychobiology of Sex Orientation: p80). 

Another possibility is that male homosexuals actually lie midway between heterosexual men and women in their degree of masculinization.  

On this view, homosexual men come across as relatively feminine only because we naturally tend to compare them to other men (i.e. heterosexual men). However, as compared to women, they may be relatively masculine, as reflected in the male-typical aspects of their sexuality focused upon by Symons.

Interestingly, this latter interpretation suggests the slightly disturbing possibility that, freed from the restraints imposed by women, heterosexual men would be even more indiscriminately promiscuous than their homosexual counterparts.

Evidence consistent with this interpretation is provided by one study from the 1980s which found that, when approached by a female stranger (also a student), on a University campus, with a request to go to bed with them, fully 72% of male students agreed (Clark and Hatfield 1989). 

In contrast, in the same study, not a single one of the 96 females approached by male strangers with the same request on the same university campus agreed to go to bed with the male stranger.

Yet what percentage of the female students subsequently sued the university for sexual harassment was not reported.

Pornography as a “Natural Experiment

For Symons, fantasy represents another window onto sexual and romantic desires. Like homosexuality, fantasy is, by its very nature, unconstrained by the conflicting desires of the opposite sex (or indeed by anything other than the imagination of the fantasist). 

Symons later collaborated in an investigation into sexual fantasy by means of a questionnaire (Ellis and Symons 1990). 

However, in the present work, he investigates fantasy indirectly by focusing on what he calls “the natural experiment of commercial periodical publishing” – i.e. pornographic magazines (p182).

In many respects, this approach is preferable to a survey because, even in an anonymous questionnaire, individuals may be less than honest when dealing with a sensitive topic such as their sexual fantasies. On the other hand, they are unlikely to regularly spend money on a magazine unless they are genuinely attracted by its contents.

Before the internet age, softcore pornographic magazines, largely featuring female nudes, commanded sizeable circulations, despite the not insubstantial stigma attached to their purchase. However, their readership (if indeed ‘readership’ is the right words, since there was typically little reading involved, save of the ‘one-handed’ variety) was almost exclusively male.

In contrast, there was little or no female audience for magazines containing pictures of naked males. Instead, magazines marketed towards women (e.g. fashion magazines) contain, mostly, pictures of other women.

Indeed, when, in the 1970s, attempts were made, in the misguided name of feminism and ‘women’s liberation, to market magazines featuring male nudes to a female readership, one such title, Viva, abandoned publishing male nudes after just a few years due to lack of interest or demand, then subsequently went bust just a few years after that, while the other, Playgirl, although it remained in publication for many years and did not entirely abandon male nudes, was notorious, as a consequence, for attracting a readership composed in large part of homosexual men.

Symons thus concludes forcefully and persuasively: 

The notion must be abandoned that women are simply repressed men waiting to be liberated” (p183). 

Indeed, though it has been loudly and enthusiastically co-opted by feminists, this view of women, and of female sexuality – namely women as “repressed men waiting to be liberated” – represents an obviously quintessentially male persepective. 

Indeed, taken to extremes, it has even been used as a justification for rape.

Thus, the curious, though recurrent, sub-Freudian notion that female rape victims actually secretly enjoy being raped seems to rest ultimately on the assumption that female sexuality is fundamentally the same as that of men (i.e. indiscriminately enjoying of promiscuous sex) and that it is only women’s alleged sexual ‘repression’ that prevents them admitting as much.[12]

Romance Literature 

Unfortunately, however, there is notable omission in Symons’s discussion of pornography as a window into male sexuality – namely, he omits to consider whether there exists any parallel artistic genre that offers equivalent insight into the female psyche.

Later writers on the topic have argued that romance novels (e.g. Mills and Boon, Jane Austin), whose audience is as overwhelmingly female as pornography’s is male, represent the female equivalent of pornography, and that analysis of the the content of such works provides insights into female mate preferences parallel to those provided into male psychology by pornography (e.g. Kruger et al 2003; Salmon 2004; see also Warrior Lovers: Erotic Fiction, Evolution and Female Sexuality, co-authored by Symons himself).

Thus, popular science writer Matt Ridley reports:

Two industries relentlessly exploit the sexual fantasizing of men and women: pornography and the publishing of romance novels: Pornography is aimed almost entirely at men. It varies little from a standard formula all over the world… The romance novel, by contrast, is aimed entirely at a female market. It, too, depicts a fictional world that has changed remarkably little except in adapting to female career ambitions and to a less inhibited attitude toward the description of sex” (The Red Queen: p270-271)

Symons touches upon this analogy only in passing, when he observes that:

Heterosexual men are, of course, aware that the female sexuality portrayed in men’s magazines reflects male fantasy more than female reality, just as heterosexual women are aware that the happy endings of stories in romance magazines exist largely in the realm of fantasy” (p293).

Yet, while feminists perpetually complain about how pornography supposedly creates unrealistic expectations of women and girls and puts undue pressure on women and girls to live up to this male fantasy, few men complain about how the equally unrealistic portrayal of men in romance literature creates unrealistic expectations of boys and men and puts undue pressure on boys and men to live up to a female fantasy.

Female Orgasm as Non-Adaptive

An entire chapter of ‘The Evolution of Human Sexuality’, namely Chapter Three (entitled, “The Female Orgasm: Adaptation or Artefact”), is devoted to rejecting the claim that the female orgasm represents a biological adaptation.

This is perhaps excessive. However, it does at least conveniently contradicts the claim of some critics of evolutionary psychology, and of sociobiology, such as Stephen Jay Gould that the field is ‘ultra-Darwinian’ or ‘hyper-adaptionist’ and committed to the misguided notion that all traits are necessarily adaptive.[13]

In contrast, Symons champions the thesis that the female capacity for orgasm is a simply non-adaptive by-product of the male capacity to orgasm, the latter of which is of course adaptive.

On this view, the female orgasm (and clitoris) is, in effect, the female equivalent of male nipples (only more fun).

Certainly, Symons convincingly critiques the romantic notion, popularized by Desmond Morris among others, that the female orgasm functions as a mechanism designed to enhance ‘pair-bonding between couples.

However, subsequent generations of evolutionary psychologists have developed less naïve models of the adaptive function of female orgasm.

For example, Geoffrey Miller argues that the female orgasm, and clitoris, functions as an adaptation for mate choice (The Mating Mind: p239-241).

Of course, at first glance, experiencing orgasm during coitus may appear to be a bit late for mate choice, since, by the time coitus has occurred, the choice in question has already been made. However, given that, among humans, most sexual intercourse is non-reproductive (i.e. does not result in conception), the theory is not altogether implausible.

On this view, the very factors which Symons views as suggesting female orgasm is non-adaptive – such as the relative difficultly of stimulating female orgasm during ordinary vaginal sex – are positive evidence for its adaptive function in carefully discriminating between suitors/lovers to determine their desirability as father for a woman ’s offspring.

Nevertheless, at least according to the stringent criteria set out by George C Williams in his classic Adaptation and Natural Selection, as well as the more general principle of parsimony (also known as Occam’s Razor), the case for female orgasm as an adaptation remains unproven (see also Sherman 1989; Case Of The Female Orgasm: Bias in the Science of Evolution).

Out-of-Date?

Much of Symons’ work is dedicated to challenging the naïve group-selectionism of Sixties ethologists, especially Desmond Morris. Although scientifically now largely obsolete, Morris’s work still retains a certain popular resonance and therefore this aspect of Symons’s work is not entirely devoid of contemporary relevance.

In place of Morris‘s rather idyllic notion that humans are a naturally monogamous ‘pair-bonding’ species, Symons advocates instead an approach rooted in the individual-level (or even gene-level) selection championed Richard Dawkins in The Selfish Gene (reviewed here).

This leads to some decidedly cynical conclusions regarding the true nature of sexual and romantic relations among humans.

For example, Symons argues that it is adaptive for men to be less sexually attracted to their wives than they are to other women – because they are themselves liable to bear the cost of raising offspring born to their wives but not those born to other women with whom they mate (e.g. those attached to other males).

Another cynical conclusion is that the primary emotion underlying the institution of marriage, both cross-culturally and in our own society, is neither love nor even lust, but rather male sexual jealousy and proprietariness (p123). 

Marriage, then, is an institution borne not of love, but of male sexual jealousy and the behaviour known to biologists as mate-guarding.

Meanwhile, in his excellent chapter on ‘Copulation as a Female Service’ (Chapter Eight), Symons suggests that many aspects of heterosexual romantic relationships may be analogous to prostitution.

As well as its excessive focus on debunking sixties ethologists like Morris, ‘The Evolution of Human Sexuality’ is also out-of-date in a more serious respect Namely, it fails to incorporate the vast amount of empirical research on human sexuality from a sociobiological perspective which has been conducted since the first publication of his work.

For a book first published thirty years ago, this is inevitable – not least because much of this empirical research was inspired by Symons’ own ideas and specifically designed to test theories formulated in this very work.

In addition, potentially important new factors in human reproductive behaviour that even Symons did not foresee have been identified, for example role of levels of fluctuating asymmetry functioning as a criterion for, or at least correlate of, physical attractiveness.

For an updated discussion of the evolutionary psychology of human sexual behaviour, complete with the latest empirical data and research, readers should consult the latest edition of David Buss’s The Evolution Of Desire: Strategies of Human Mating.

In contrast, in support of his theories Symons relies largely on classical literary insight, anecdote and, most importantly, a review of the ethnographic record.

However, this latter focus ensures that, in some respects, the work remains of more than merely of historical interest.

After all, one of the more legitimate criticisms levelled against recent research in evolutionary psychology is that it is insufficiently cross-cultural and, with several notable exceptions (e.g. Buss 1989), relies excessively on research conducted among convenience samples of students at western universities.

Given costs and practicalities, this is inevitable. However, for a field that aspires to understand a human nature presumed to be universal, such a method of sampling is highly problematic, especially given what has recently been revealed about the ‘WEIRD-ness’ of western undergraduate samples.

The Evolution of Human Sexuality’ therefore retains its importance for two reasons. 

First, is it the founding work of modern evolutionary psychological research into human sexual behaviour, and hence of importance as a landmark and classic text in the field, as well as in the history of science more generally. 

Second, it also remains of value to this day for the cross-cultural and ethnographic evidence it marshals in support of its conclusions. 

Endnotes

[1] Actually, the first person to discover this, albeit inadvertently, was the great Victorian polymath, pioneering statistician and infamous eugenicist Francis Galton, who, attempting to discover abnormal facial features possessed by the criminal class, succeeded in morphing the faces of multiple convicted criminals. The result was, presumably to his surprise, an extremely attractive facial composite, since all the various minor deformities of the many convicted criminals whose faces he morphed actually balanced one another out to produce a face with few if any abnormalities or disproportionate features.

[2] More recent research in this area has focused on the related concept of fluctuating asymmetry.

[3] However, recent meta-analyses have called into question the evidence for cyclical fluctuations in female mate preferences (Wood et al 2014; cf. Gildersleeve et al 2014), and it has been suggested that such findings may represent casualties of the so-called replication crisis in psychology. It has also been questioned whether ovulation in humans is indeed concealed, or is actually detectable by subtle cues (e.g. Miller et al 2007), for example, changes in face shape (Oberzaucher et al 2012), breast symmetry (Scutt & Manning 1996) and body scent (Havlicek et al 2006).

[4] Another factor leading recent researchers to overestimate the importance of female choice in human evolution is their feminist orientation, since female choice gives women an important role in human evolution, even, paradoxically, in the evolution of male traits.

[5] Actually, in most cultures, only a girl’s first marriage is arranged on her behalf by her parents. Second- and third-marriages are usually negotiated by the woman herself. However, since female fertility peaks early, it is a girl’s first marriage that is usually of the most reproductive, and hence Darwinian, significance.

[6] Indeed, the human anatomical trait in humans that perhaps shows the most evidence of being a product of intersexual selection is a female one, namely the female breasts, since the latter are, unlike the mammary glands of most other mammals, permanently present from puberty on, not only during lactation, and composed primarily of fatty tissues, not milk (Møller 1995; Manning et al 1997; Havlíček et al 2016). 

[7] Wilson terms his theory “the kin selection theory hypothesis of the origin of homosexuality” (p145). However, a better description might be the ‘helper at the nest theory of homosexuality’, the basic idea being that, like sterile castes in some insects, and like older siblings in some bird species where new nest sites are unavailable, homosexuals, rather than reproducing themselves, direct their energies towards assisting their collateral kin in successfully raising, and provisioning, their own offspring (On Human Nature: p143-7). The main problem with this theory is that there is no evidence that homosexuals do indeed devote any greater energies towards assisting their kin in raising offspring. On the contrary, homosexuals instead seem to devote much of their time and resources towards their own sex life, much as do heterosexuals (Bobrow & Bailey 2001).

[8] As we will see, contrary to the stereotype of evolutionary psychologists as viewing all traits as necessarily adaptive, as they are accused of doing by the likes of Gould, Symons also argued that the female orgasm and menopause are non-adaptive, but rather by-products of other adaptations.

[9] This is not necessarily to say that rampant, indiscriminate promiscuity is a male utopia, or the ideal of any man, be he homosexual or heterosexual. On the contrary, the ideal mating system for any individual male is harem polygyny in which the chastity of his own partners is rigorously policed (see Laura Betzig’s Despotism and Differential Reproduction: which I have reviewed here). However, given an equal sex ratio, this would condemn other males to celibacy and perpetual ‘inceldom. Similarly, Symons reports that “Homosexual men, like most people, usually want to have intimate relationships”. However, he observes:

Such relationships are difficult to maintain, largely owing to the male desire for sexual variety; the unprecedented opportunity to satisfy this desire in a world of men, and the male tendency towards sexual jealousy” (p297).  

It does indeed seem to be true that homosexual relationships, especially those of gay males, are, on average, of shorter duration than are heterosexual relationships. However, Symons’ claim regarding “the male tendency towards sexual jealousy” is questionable.
Actually, subsequent research in evolutionary psychology has suggested that men are no more prone to jealousy than women, but rather that it is sorts of behaviours which most intensely provoke such jealousy that differentiate the sexes (Buss 1992). Moreover, many gay men practice open relationships, which seems to suggest a lack of jealousy – or perhaps this simply reflects a recognition of the difficulty of maintaining relationships given, as Symons puts it, “the male desire for sexual variety [and] the unprecedented opportunity to satisfy this desire in a world of men”. 

[10] Indeed, far from men being led to objectify women due to the portrayal of women in a sexualized manner in the media, Symons suggests:

There may be no positive feedback at all; on the contrary, constant exposure to pictures of nude and nearly nude female bodies may to some extent habituate [i.e. desensitize] men to these stimuli” (p304).

[11] Admittedly, some aspects of body-type typically preferred by gay males (especially the so-called twink ideal) do reflect apparently female traits, especially a relative lack of body-hair. However, lack of body-hair is also obviously indicative of youth. Moreover, a relative lack of body-hair also seems to be a trait favoured in men by heterosexual women. For a discussion of the relative preference on the part of (heterosexual) females for masculine versus feminine physical appearance in male sex partners, see here.

[12] Thus, some men might indeed welcome being ‘raped’, albeit only under highly unusual circumstances – namely by an attractive opposite-sex partner (or, in the case of homosexual men, an attractive same-sex partner) to whom they are sexually attracted. Thus, Kingsley Browne, in his excellent Biology at Work (which I have reviewed here) quotes the perhaps remarkable finding that:

A substantial number of men ‘viewed an advance by a good-looking woman who threatened harm or held a knife as a positive sexual opportunity’” (Biology at Work: p196; quoting Struckman-Johnson & Struckman-Johnson 1994).

Of course, large numbers of women also report rape fantasies (Bivona & Critelli 2009). Yet this does not, of course, mean they would actually welcome real sexual assault, which would almost certainly take a very different form from the fantasy. In practice, therefore, members of neither sex are ever likely to welcome sexual assault in the form which it is actually likely to actually come.

[13] Incidentally, Symons also rejects the theory that the female menopause is adaptive, a theory which has subsequently become known as the grandmother hypothesis (p13). Also, although it does not directly address the issue, Symons’ discussion of human rape (p276-85), has also been interpreted as implicitly favouring the theory that rape is a by-product of the greater male desire for commitment free promiscuous sex, rather than the product of a specific rape adaptation in males (see Palmer 1991; and A Natural History of Rape: reviewed here). 

References 

Bellis & Baker (1990). Do females promote sperm competition?: Data for humans. Animal Behavior, 40: 997-999.
Bivona & Critelli 2009 The nature of women’s rape fantasies: an analysis of prevalence, frequency, and contents. Journal of Sex Research 46(1):33-45
Clark & Hatfield (1989) Gender differences in receptivity to sexual offers Journal of Psychology and Human Sexuality 2(1):39-55
Bobrow & Bailey (2001). Is male homosexuality maintained via kin selection? Evolution and Human Behavior, 22: 361-368.
Bogaert & Hershberger (1999) The relation between sexual orientation and penile size. Archives of Sexual Behavior 1999 Jun;28(3) :213-21. 
Buss (1989). Sex differences in human mate preferences: Evolutionary hypotheses tested in 37 cultures. Behavioral and Brain Sciences 12: 1-49.
Ellis & Ames (1987) Neurohormonal Functioning and Sexual Orientation: A Theory of Homosexuality-Heterosexuality, Psychological Bulletin 101(2): 233-58
Ellis & Ratnasingam (2012) Gender, Sexual Orientation, and Occupational Interests: Evidence of Androgen Influences. Mankind Quarterly  53(1): 36–80
Ellis & Symons (1990) Sex differences in sexual fantasy: An evolutionary psychological approach, Journal of Sex Research 27(4): 527-555.
Evans (1972) Physical and biochemical characteristics of homosexual menJournal of Consulting and Clinical Psychology, 39(1), 140–147
Gildersleeve, Haselton & Fales (2014) Do women’s mate preferences change across the ovulatory cycle? A meta-analytic review. Psychological Bulletin 140(5):1205-59.
Havlíček, Dvořáková, Bartos & Fleg (2006) Non‐Advertized does not Mean Concealed: Body Odour Changes across the Human Menstrual Cycle. Ethology 112(1):81-90.
Havlíček et al (2016) Men’s preferences for women’s breast size and shape in four cultures. Evolution and Human Behavior 38(2): 217–226.
Kenrick & Keefe (1992). Age preferences in mates reflect sex differences in human reproductive strategies. Behavioral and Brain Sciences, 15: 75-133. 
Kruger et al (2003) Proper and Dark Heroes as Dads and Cads. Human Nature 14(3): 305-317.
Manning et al (1997) Breast asymmetry and phenotypic quality in women. Ethology and Sociobiology 18(4): 223–236.
Miller (1998). How mate choice shaped human nature: A review of sexual selection and human evolution. In C. Crawford & D. Krebs (Eds.), Handbook of Evolutionary Psychology: Ideas, Issues, and Applications (pp. 87-129). Mahwah, NJ: Lawrence Erlbaum.
Miller, Tybur & Jordan (2007). Ovulatory cycle effects on tip earnings by lap dancers: economic evidence for human estrous? Evolution and Human Behavior. 28(6):375–381.
Møller et al (1995) Breast asymmetry, sexual selection, and human reproductive success. Ethology and Sociobiology 16(3): 207-219.
Palmer (1991) Human Rape: Adaptation or By-Product? Journal of Sex Research 28(3): 365-386.
Penton-Voak et al (1999) Menstrual cycle alters face preferences, Nature 399 741-2.
Puts (2010) Beauty and the Beast: Mechanisms of Sexual Selection in Humans. Evolution and Human Behavior 31 157-175.
Salmon (2004) The Pornography Debate: What Sex Differences in Erotica Can Tell Us About Human Sexuality. In Evolutionary Psychology, Public Policy and Personal Decisions (London: Lawrence Erlbaum Associates, 2004).
Scutt & Manning (1996) Symmetry and ovulation in women. Human Reproduction 11(11):2477-80.
Sherman (1989) The clitoris debate and levels of analysis, Animal Behaviour, 37: 697-8.
Struckman-Johnson & Struckman-Johnson (1994) Men’s reactions to hypothetical female sexual advances: A beauty bias in response to sexual coercion. Sex Roles 31(7-8): 387–405.
Wood et al (2014). Meta-analysis of menstrual cycle effects on women’s mate preferencesEmotion Review, 6(3), 229–249.