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Sinon un truc marrant.
la ceinture de chasteté est par dessus la petite culotte. C'est un peu couillon, pas vrai?

It’s an evolutionary paradox that’s frustratingly difficult for biologists to explain, but researchers may have just found a benefit conferred by homosexual sex that could offer an explanation as to why this behavior has persevered, at least in one species. 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.

If a certain trait or behavior is detrimental to the reproductive success, or fitness, of an organism, you wouldn’t expect it to persist in the population as natural selection should get rid of it. After all, the aim of the reproductive game is to keep your genes going. Why, then, do members of the same sex cop off with each other in so many species? And we’re not just talking about homosexual behaviors (observed in more than 1,500 species, since you asked); we mean the whole shebang. (l'expression journalistique de merde)

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The researchers found that while their data lent more weight to the overdominance hypothesis, their results did not exclusively support one over the other. In fact, they think that both could be contributing to the maintenance of SSB in the gene pool. But that wasn’t the most interesting find of the study: Males with a genetic makeup associated with high levels of SSB produced female offspring with higher rates of reproduction, or fecundity. This suggests that genes associated with SSB could be persisting in the population because they actually confer a fitness advantage in females, despite being reproductively harmful to males.

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