Humans belong to the animal group called mammals and within mammals we also belong to the subgroup called primates. Mammals have been around for about 225 million years. The first primates appeared around 55 million years ago. Given our ancestry, we need a strong supporting argument for suggesting that human sexuality differs significantly to our closest relatives in the animal kingdom.
For mammals the male nearly always initiates the act of mating. The act of mating inherently involves male ejaculation, which implies male orgasm or an equivalent physiological event that could cause ejaculation. Within primates it is noticeable that the male is interested in genital stimulation and in exploring the genitals of the opposite sex.
The female primate is much less interested in exploring her own or a male’s genitals. Some females will offer to stimulate a male or allow the male to stimulate them genitally. This is clearly not about responsiveness but a behaviour some females have. If it were responsiveness (a subconscious response), then every female would respond in the same way.
There is no evidence to suggest that female mammals orgasm any time. In other mammals, masturbation is primarily associated with males. Some female mammals do masturbate but since they do not ejaculate it is difficult to establish that female mammals stimulate themselves to orgasm.
So if we are to scientifically prove that women can orgasm by any means, we need strong evidence. The research evidence in support of women’s ability to orgasm through masturbation alone is fairly strong. Kinsey found that women who engaged in sexual activity alone (masturbation) were successful in achieving orgasm 95% of the time.
Women who said that orgasm was possible with a lover were less confident of their experience. Kinsey found that only two out of every five women (40%) who engaged in sexual activity with a lover (intercourse) said it was possible to orgasm only three times out of four (75% of the time). The rest found orgasm to be less reliable and a considerable number did not believe that orgasm was possible with a lover.
The availability of reliable contraception caused people assume that if women were protected from pregnancy, intercourse should instantly become for women exactly what it represented for men: an opportunity to enjoy erotic pleasure, arousal and orgasm. But our emotional and sexual responses have evolved over hundreds of thousands of years.
While male orgasm (co-incident with ejaculation) is 100% vital to men’s reproductive capability, female orgasm has zero impact on women’s ability to conceive. A woman does not ejaculate her reproductive material as a man does (sperm). A woman has a life-time supply of eggs within her body from the day she is born that are automatically released as part of her monthly ovulation cycle.
We evolve the capabilities that we need for survival and for reproduction. Female orgasm plays no role in reproduction and so women have not evolved the same capability for easy arousal and orgasm that men have. Female orgasm is an evolutionary redundancy.
The internal reproductive organs develop from completely different anatomy in the foetus. There is no overlap between the male and the female. A man doesn’t have a vagina so there is no biological precedent for assuming that women might be capable of being stimulated to orgasm through the vagina. There is no precedent for female orgasm by any means except for the common anatomy that women share with men.
The only sexual anatomy that men and women share is the sex organ. Every embryo has a structure that eventually forms a person’s sex organ (clitoris or penis). The clitoris is referred to as the homologue of (equivalent organ to) the penis.
Men’s top reproductive priority is to maximise his ejaculations and increase his changes of procreating. This means that men are responsive because male orgasm occurs with male ejaculation. Women’s top reproductive priority is to find a mate who will be dedicated to protecting and supporting her through the long process of bearing and raising a child.
Intercourse is a territorial act of dominance by the male over the female. This is very clear from nature and explains why most women want to know a man well before they enter into a sexual relationship with him. Women are attracted to men who exude charm, affection and emotional warmth.
Women need to work out whether they will get anything from the man in return for providing him with a regular sexual outlet. The vast majority of women offer a man sex because they identify him as a worthy mate and a supportive companion. A woman hopes that by offering a man short-term pleasure she will obtain his love, respect, and support for her family goals.
Outside of the human species, orgasm is infrequent and possibly absent among females of most species of mammal. (Alfred Kinsey 1953)