ⓘ Human male sexuality
Human male sexuality encompasses a wide variety of feelings and behaviors. Mens feelings of attraction may be caused by various physical and social traits of their potential partner. Mens sexual behavior can be affected by many factors, including evolved predispositions, individual personality, upbringing, and culture. While most men are heterosexual, significant minorities are homosexual or varying degrees of bisexual.
1. Sexual attraction
Mens mate preferences for women are based on both physical and non-physical factors. There is a great deal of cross-cultural similarity in mens preferences, but there are a few notable differences as well.
1.1. Sexual attraction Physical factors
Research indicates that men tend to be attracted to young women with bodily symmetry. Facial symmetry, femininity, and averageness are also linked with attractiveness. Men typically find female breasts attractive and this holds true for a variety of cultures. A preference for lighter-skinned women has been documented across many cultures.
Women with a relatively low waist-to-hip ratio WHR are considered more attractive. The exact ratio varies among cultures, depending on the WHR of the women in the local culture. In Western cultures, a WHR of 0.70 is preferred. Other possible physical factors of attraction include low body mass index, low waist circumference, longer legs, and greater lower back curvature. Preference for a slim or a plump body build is culturally variable, but in a predictable manner. In cultures where food is scarce, plumpness is associated with higher status and is more attractive, but the reverse is true in wealthy cultures.
Men generally prefer their wives to be younger than they are, but by how much exactly varies between cultures. Older men prefer greater age differences, while teenage males prefer females slightly older than they are.
The exact degree to which physical appearance is considered important in selecting a long-term mate varies between cultures.
1.2. Sexual attraction Non-physical factors
When choosing long-term partners, men desire those who are intelligent, kind, understanding, and healthy. They also want their partner to share their values and be similar in attitudes and personality.
The importance of premarital chastity varies a great deal according to culture, but across cultures marital unfaithfulness is more upsetting to men than any other pain their wife could inflict.
2. Sexual behavior
Many factors influence mens sexual behavior. These include evolved tendencies, such as a greater interest in casual sex, as well as individual and social factors related to upbringing, personality, and relationship status.
2.1. Sexual behavior Interest in casual sex
Compared to women, men have a greater interest in casual sex. On average, men express a greater desire for a variety of sex partners, let less time elapse before seeking sex, lower their standards dramatically when pursuing short-term mating, have more sexual fantasies and more fantasies involving a variety of sex partners, report having a higher sex drive, find cues to sexual exploitability to be attractive for short-term mating, experience more sexual regret over missed sexual opportunities, have a larger number of extramarital affairs and are more likely to seek hookups and friends with benefits, and visit prostitutes more often.
2.2. Sexual behavior Upbringing and personality
One study has several factors that influence the age of first sexual intercourse among both genders. Those from families with both parents present, from high socioeconomic backgrounds, who performed better at school, were more religious, who had higher parental expectations, and felt like their parents care, showed lower levels of sexual activity across all age groups in the study age 13–18. In contrast, those with higher levels of body pride, showed higher levels of sexual activity.
2.3. Sexual behavior Sociosexuality
Males who are in a committed relationship have a restricted sociosexual orientation, and will have different sexual behavior compared to males who have an unrestricted sociosexual orientation. Males with a restricted sociosexual orientation will be less willing to have sex outside of their committed relationship and behave according to their desire for commitment and emotional closeness with their partner.
Sociosexually restricted males are less likely to approach females who have lower waist-to-hip ratios 0.68–0.72, generally rated as more physically attractive.
2.4. Sexual behavior Expected parental investment
Elizabeth Cashdan proposed that mate strategies among both genders differ depending on how much parental investment is expected of the male, and provided research support for her hypotheses. When men expect to provide a high level of parental investment, they will attempt to attract women by emphasising their ability to invest. In addition, men who expect to invest will be more likely to highlight their chastity and fidelity than men who expect not to invest. Men with the expectation of low parental investment will flaunt their sexuality to women. Cashdan argues the fact the research supports the idea that men expecting to invest emphasise their chastity and fidelity, which is a high cost strategy because it lowers reproductive opportunities, suggests that type of behaviour must be beneficial, or the behaviour would not have been selected.
2.5. Sexual behavior Paternity certainty
Paternity certainty is the extent to which a male knows or believes that a womans child is his.
In polygamous societies, men feel greater sexual jealousy when there is low paternity certainty. This is because they do not want to risk wasting time, energy and resources on a child that is not theirs.
Socio-economic differences between cultures also affect paternity certainty. In a "natural fertility" country such as Namibia, 96% of males show sexual jealousy.
Additionally, there is greater likelihood of paternity loss and paternity uncertainty when there is a lack of contraceptives.
2.6. Sexual behavior Sexual violence
Far more men than women commit rape. It may be that rape is a non-adaptive by-product of other evolved mechanisms, such as desire for sexual variety and for sex without investment, sensitivity to sexual opportunities, and a general capacity for physical aggression. Masculine gender roles and a sense of general and sexual entitlement predict rape-related attitudes and behaviors in men. However, it could be that evolutionary selection in the ancestral environment in some cases favored males who raped, resulting in rape itself being an adaptation. Scholars from several fields have criticized this idea. David Buss states that clear-cut evidence either way is lacking.
3.1. Homosexuality Sexual orientation
Sexual orientation refers to ones relative attraction to men, to women, or to both. Most researchers studying sexual orientation focus on patterns of attraction rather than behavior or identity, because culture affects the expression of behavior or identity and it is attraction that motivates behavior and identity, not the other way around.
Aside from being heterosexual or homosexual, individuals can be any of varying degrees of bisexual. Many researchers expect that in all cultures the vast majority of people are sexually predisposed exclusively to the other sex, with a minority being sexually predisposed to the same sex, whether exclusively or not. In Western surveys, about 93% of men identify as completely heterosexual, 4% as mostly heterosexual, 0.5% as more evenly bisexual, 0.5% as mostly homosexual, and 2% as completely homosexual. An analysis of 67 studies found that the lifetime prevalence of sex between men regardless of orientation was 3-5% for East Asia, 6-12% for South and South East Asia, 6-15% for Eastern Europe, and 6-20% for Latin America. The World Health Organization estimates a worldwide prevalence of men who have sex with men between 3 and 16%.
Sexual orientation can be measured via self-report or physiologically. Multiple physiological methods exist, including measurement of penile erection, viewing time, fMRI, and pupil dilation. In men, these all show a high degree of correlation with self-report measures, including men who self report as "mostly straight" or "mostly gay."
3.2. Homosexuality Causes
Although no causal theory has yet gained widespread support, there is considerably more evidence supporting nonsocial causes of sexual orientation than social ones, especially for males. This evidence includes the cross-cultural correlation of homosexuality and childhood gender nonconformity, moderate genetic influences found in twin studies, evidence for prenatal hormonal effects on brain organization, the fraternal birth order effect, and the finding that in rare cases where infant males were raised as girls due to physical deformity, they nevertheless turned out attracted to females. Hypothesized social causes are supported by only weak evidence, distorted by numerous confounding factors. Cross-cultural evidence also leans more toward non-social causes. Cultures that are very tolerant of homosexuality do not have significantly higher rates of it. Homosexual behavior is relatively common among boys in British single-sex boarding schools, but adult Britons who attended such schools are no more likely to engage in homosexual behavior than those who did not. In an extreme case, the Sambia ritually require their boys to engage in homosexual behavior during adolescence before they have any access to females, yet most of these boys become heterosexual.
It is not fully understood why the genes for homosexuality, or allowing it to develop, whatever they may be, persist in the gene pool. One hypothesis involves kin selection, suggesting that homosexuals invest heavily enough in their relatives to offset the cost of not reproducing as much directly. This has not been supported by studies in Western cultures, but several studies in Samoa have found some support for this hypothesis. Another hypothesis involves sexually antagonistic genes, which cause homosexuality when expressed in males but increase reproduction when expressed in females. Studies in both Western and non-Western cultures have found support for this hypothesis.
3.3. Homosexuality Possible adaptive function
Due to its existence in diverse cultures and through history, some researchers have argued that homosexual behavior has an adaptive function related to same-sex affiliation or alliance formation. Frank Muscarella argued that homoeroticism serves an indirect adaptive purpose, though this disposition would vary genetically among individuals. R.C. Kirkpatrick similarly argued that homosexual behavior may be a type of reciprocal altruism or resource exchange, facilitating same-sex alliance formation, and that sexualization of these alliances occurs more often when competition for partners is especially severe. They stated homosexual behavior helped reduce aggression between males, facilitated same-sex affiliation and alliance formation, and that it often occurred between males with a significant age or status difference. These relationships may have brought many benefits to the younger males, such as access to food, protection from aggression, greater status, and access to females. They point to the historical record for support, including examples such as pederasty in ancient Greece.
3.4. Homosexuality Criticism
Evolutionary psychologist David Buss criticized the alliance hypothesis, arguing it faces several empirical difficulties. He states that there is no evidence that most young men in most cultures use homoerotic behavior to establish alliances; instead, the norm is for same-sex alliances to not be accompanied by any sexual activity. Additionally, he states that there is no evidence that men who engage in homoerotic behavior do better than other men at forming alliances or ascending in status.
Criticism from other researchers has been on various grounds. They have commented that the cultural data on sexual practices are sketchy and uneven; that there is no need to assume that homosexual behavior, more than any other sexual behavior, is under direct selection rather than being a neutral byproduct; that the hypothesis ignores the existence of sexual orientation; that it contradicts findings that behaviorally homosexual or bisexual men have much lower rates of fatherhood; that there is no evidence that men with bisexual experience have higher evolutionary fitness or are better than heterosexual men at forming same-sex alliances; that it does not account for the preponderance of nonsexual alliance formation; that primate homosexual behavior is not a uniform phenomenon and varies within and across species; and that since same-sex sexual partners are chosen on the basis of sexual emotion in contrast to bonobos, for example, useful alliances of this kind would only occur as often as mutual sexual attraction, and such variability would seem to indicate a lack of design by natural selection.
3.5. Homosexuality Sexual identity
What impact same-sex sexuality has upon ones social identity varies across cultures. The question of precisely how cultures through history conceptualized homosexual desire and behavior is a matter of some debate.
In much of the modern world, sexual identity is defined based on the sex of ones partner. In some parts of the world, however, sexuality is often socially defined based on sexual roles, whether one is a penetrator or is penetrated.
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