By Jared Diamond
An interesting and informative examine of human sexuality explores how and why people' intercourse lives fluctuate noticeably from these of different animals and examines the evolutionary forces and elements that experience formed human sexual differences.
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Extra resources for Why Is Sex Fun?: The Evolution Of Human Sexuality (Science Masters)
Sample text
No one could claim that men's and women's parental contributions are equal: they tend to be grossly unequal in most marriages and societies. But most fathers make some contribution to their children, even if it's just food or defense or land rights. We take such contributions so much for granted that they're written into law: divorced fathers owe child support, and even an unwed mother can sue a man for child support if genetic testing proves that he is her child's father. But that's our warped human perspective.
This question becomes even more acute when we compare ourselves with our closest relatives among the world's mammal species, the great apes (as distinguished from the gibbons or little apes). 6 percent of our nuclear genetic material (DNA). 6 percent different). Our ancestors diverged “only” about seven million years ago from the ancestors of chimpanzees and bonobos, nine million years ago from the ancestors of gorillas, and fourteen million years ago from the ancestors of orangutans. That sounds like an enormous amount of time in comparison to an individual human lifetime, but it's a mere eye-blink on the evolutionary time scale.
4: Marriage partners usually have sex in private, rather than being indifferent to the presence of other humans. 5: Human ovulation is concealed rather than advertised. That is, women's brief period of fertility around the time of ovulation is difficult to detect for their potential sex partners as well as for most women themselves. A woman's sexual receptivity extends beyond the time of fertility to encompass most or all of the menstrual cycle. Hence, most human copulations occur at a time unsuitable for conception.