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February 4, Male homosexuality doesn't make complete sense from an evolutionary point of view. It appears that the trait is heritable, but because homosexual men are much less likely to produce offspring than heterosexual men, shouldn't the genes for this trait have been extinguished long ago?

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According to a new study in fruit flies, not only does same-sex sexual behavior seem to be heritable, but females with a genetic makeup associated with this trait actually display higher reproductive rates, which is an evolutionary advantage. These fascinating findings have been published in Proceedings of the Royal Society B. After all, the aim of the reproductive game is to keep your genes going.

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Newly married couple Richard Dowling and Cormac Gollogly kiss after the first same-sex marriage takes place on November 17,in Clonmel, Ireland. Why are there homosexuals? At first glance, it's a silly, even offensive question—some people are gay, and you'll just have to deal with it.

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By Michael Le Page. There are numerous evolutionary mechanisms that might explain homosexual behaviour, which is common in many species of animals. Homosexual behaviour has been observed in hundreds of speciesfrom bison to penguins.

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Homosexuality can refer to both attraction or sexual behavior between people of the same sex, or to a sexual orientation. When describing the latter, it refers to enduring sexual and romantic attraction towards those of the same sex, but not necessarily to sexual behavior. Most scientist today agree that sexual orientation is most likely the result of a complex interaction of environmental, cognitive and biological factors.

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Why we should stop caring what evolution has to say about homosexuality. Pride month. I amusedly thought back to my evening at Pink Dot SG Singapore last year, and how it probably generated enough controversy to last several months.

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The evolutionist view of the origin of homosexuality in contrast to the creationist explanation is reviewed. Creationists conclude that the physical bodies and minds of humans were designed to produce heterosexual behaviour for the primary purposes of reproduction and bonding. Darwinism would select for fertility and thus heterosexuality, but would be neutral relative to homosexual behaviour that did not interfere with reproduction rates.

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Homosexuality is romantic attraction, sexual attractionor sexual behavior between members of the same sex or gender. It "also refers to a person's sense of identity based on those attractions, related behaviors, and membership in a community of others who share those attractions. Along with bisexuality and heterosexualityhomosexuality is one of the three main categories of sexual orientation within the heterosexual—homosexual continuum.

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Republish our articles for free, online or in print, under Creative Commons licence. When I give talks about the relevance of evolution to modern life, I can count on one regular question interrupting an orderly transition from lecture theatre to bar. Far more often it is asked earnestly and with palpable empathy.

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It can be a sore point for evolutionary biologists who study sexual selection. In the popular coverage of evolution, mate choice too often gets overlooked, in the shadow of natural selection. Prum's new book responds to this imbalance.

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