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Female promiscuity

Promiscuity among human females

  • 16 min read
  • 4 chapters

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Through Nature versus nurture, Heredity and Bisexuality

Cause

Studies have related sociosexual orientation to sex drive, especially in women, where the higher the sex drive the less restricted the sociosexual orientation, or interest in sex outside committed relationships. Nevertheless, pertaining to the nature and nurture debate, there is some data emphasizing cultural factors, more so for women than for men. One review assessed that sociosexuality was affected almost equally by heredity and environment unshared with siblings; shared environment had relatively little effect.

Men tend to have higher sociosexuality scores and be more unrestricted than women across a variety of cultures. However, there is more variability in scores within each gender than between men and women, indicating that although the average man is less restricted than the average woman, individuals may vary in sociosexual orientation regardless of gender.

Psychology

Body esteem in women showed a significant positive correlation with sociosexual unrestrictedness. So did hip-to-waist ratio and two measures of virilization. Finally, still in the same study, alcohol consumption correlated, too, but it is unclear whether the latter promoted the former or vice versa, or if a third variable was at play.

Bisexual women tend to be less restricted in their sociosexual attitudes than both homo- and heterosexual women. In sociosexual behavior also, bisexual women reported being more unrestricted, followed by homo- and then heterosexual women.

Social power has been popularly associated with sexual infidelity among men; experimental psychologists have linked power with sexual infidelity among women also. A Dutch study involving a large survey of 1,561 professionals, concluded that "The relationship between power and infidelity was the same for women as for men, and for the same reason. These findings suggest that the common assumption (and often-found effect) that women are less likely than men to engage in infidelity is, at least partially, a reflection of traditional gender-based differences in power that exist in society."

Church-attending women score lower on promiscuity than other women, while men appear to lack this correlation.

Biology

Men and women leading polyandrous lifestyles have higher levels of testosterone. However, it is unclear whether higher levels of testosterone cause increased sex drive and in turn multiple partners or whether sexual activity with multiple partners causes the increase in testosterone. Sociosexuality in women is positively correlated with two measures of prenatal exposure to androgens—right digit ratio, and scores on the Vandenberg Mental Rotation test—providing some limited support to the virilization hypothesis of female promiscuity (see also Prenatal hormones and sexual orientation). The aforementioned hypothesis is not at all mutually exclusive with other hypotheses.

Libido is correlated with the menstrual cycle so that many women experience an increase in sexual desire several days immediately before ovulation. Testosterone levels rise gradually from about the 24th day of a woman's menstrual cycle until ovulation on about the 14th day of the next cycle.

It is common for sex drive to diminish dramatically after menopause. A number of studies, including Alfred Kinsey's, have concluded that the average age group in which women are the most active sexually is their mid-thirties, one study liberally estimating 27–45 as the limits of the age group (the average man peaks later). Women in this age group typically report having sexual fantasies greater in number and intensity, engaging in sexual activity more frequently, and being more interested in casual sex.

One study in sexual antagonism suggested a possible genetic link between female androphilic promiscuity and male androphilia: Samoan tribal women exhibited a correlation between reproductive output and the likeliness of having androphilic grandsons, though not nephews (see also Fa'afafine).

Rate of molecular evolution of the seminal protein gene SEMG2 correlates with levels of female promiscuity.

Pathological overactivity of the dopaminergic mesolimbic pathway in the brain—forming either psychiatrically, during mania, or pharmacologically, as a side effect of dopamine agonists, specifically D3-preferring agonists—is associated with various addictions and has been shown to result among some subjects of either sex in overindulgent, sometimes hypersexual, behavior.

Evolution

Bateman's principle implies that females are choosy because there is little evolutionary advantage for them to mate with multiple males. However, observation of many species, from rabbits to fruit flies, has shown that females have more offspring if they mate with a larger number of males. Exceptions to Bateman's principle abound, as do hypotheses explaining the evolution of female promiscuity. Females in fact have a lot to gain, depending on the species.

Many species once thought monogamous, including such birds as swans, are now known to engage in extra-pair copulation.

Thierry Lodé found possible evolutionary explanations for polyandry relating to sexual conflict, including mate competition and inbreeding avoidance. The following list is incomplete.

  • It is easier to ensure reproductive success (i.e., it is more likely that the female will have offspring).
  • Females may be encouraging sperm competition between males post-copulation.
  • Multiple sperm lines may confer more variation in traits to female's offspring.
  • In groups of eusocial taxa, such as beehives, a single female or caste produces offspring while the other organisms cooperate in caring for the young. Bees from different sperm lines excel at different roles within a single hive, benefiting the health of the hive as a whole.
  • In tortoise, for example, as a result of clutches with greater variation in paternal genes and increased sperm competition, females can maximize both the genetic quality and number of offspring.
  • Those female guppies who mated with a greater number of males in a given cycle, were more likely to bear sons, which in turn had more capacity for reproductive output.
  • Females may receive food offerings from prospective mates inciting copulation.
  • A female may pursue extra-pair copulation more during fertile periods of her menstrual cycle to conceive from a male with high-quality genes (see Sexy son hypothesis) while relying on resources and paternal investment from her social mate.
  • Offspring paternity is unknown and this can be beneficial in encouraging paternal care and discouraging infanticide by males.
  • Female extra-pair mating behavior may evolve via indirect selection on males.

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