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Discussions and debates over the origins of homosexuality have tended to focus on two possibilities: you’re either gay because you’ve got a “gay gene,” or you’re gay because of some aspect of your upbringing. (The latter option is usually imagined to involve something nasty, like a pedophilic priest.)
These two options—gene-gay and turned-gay—fit neatly in the (yawn) nature-nurture debate, and that probably explains why almost everyone seems to keep ignoring a third option, one for which there is astoundingly robust data: womb-gay.