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The effeminate sheep & other problems with Darwinian sexual selection.
Joan Roughgarden thinks Charles Darwin made a terrible mistake. Not about natural selection—she's no bible-toting creationist—but about his other great theory of evolution: sexual selection. According to Roughgarden, sexual selection can't explain the homosexuality that's been documented in over 450 different vertebrate species. This means that same-sex sexuality—long disparaged as a quirk of human culture—is a normal, and probably necessary, fact of life. By neglecting all those gay animals, she says, Darwin misunderstood the basic nature of heterosexuality.
[H]aving homosexual sex is the biological equivalent of apple pie: Everybody likes it. At last count, over 450 different vertebrate species could be beheaded in Saudi Arabia. You name it, there's a vertebrate out there that does it. Nevertheless, most biologists continue to regard homosexuality as a sexual outlier. According to evolutionary theory, being gay is little more than a maladaptive behavior.
Joan Roughgarden, a professor of biology at Stanford University, wants to change that perception. After cataloging the wealth of homosexual behavior in the animal kingdom two years ago in her controversial book Evolution's Rainbow—and weathering critiques that, she says, stemmed largely from her being transgendered—Roughgarden has set about replacing Darwinian sexual selection with a new explanation of sex. For too long, she says, biology has neglected evidence that mating isn't only about multiplying. Sometimes, as in the case of all those gay sheep, dolphins and primates, animals have sex just for fun or to cement their social bonds. Homosexuality, Roughgarden says, is an essential part of biology, and can no longer be dismissed. By using the queer to untangle the straight, Roughgarden's theories have the potential to usher in a scientific sexual revolution.
Darwin's theory of sex has been biological dogma ever since he postulated why peacocks flirt. His gendered view of life has become a centerpiece of evolution, one of his great scientific legacies. The culture wars over evolution and common descent notwithstanding, Darwin's theory of sexual selection has been thoroughly assimilated into mass culture. From sitcoms to beer ads, our coital "instincts" are constantly reaffirmed. Females are wary, and males are horny. Sex is this simple. Or is it?
From the pages of this month's Seed Magazine, Jonah Lehrer tells us how over 450 different animal species have been observed displaying homosexual behaviour. Read the whole article here.
