My man (?) IOZ offers his take on the nature vs. nurture debate (and I happen to agree!):

But sexuality isn’t the same as race (well, even race isn’t the same as race), and though it, like all human behaviors, has genetic and hormonal antecedents, it is not mere biological determinism that causes me to suck cock. Predilection is not identity. Human sexuality does exist on a spectrum; its characteristics and emphases change even within the individual over the course of a lifetime. Some people have very stable sexual interests; others “oscillate wildly,” as goes the title of The Smiths’ song. The fight against discrimination based on sexual identity is categorically confused: sexuality doesn’t constitute an identity. It constitutes a portion of the totality of each autonomous individual identity, and the reason not to discriminate against those whose sexual tastes and practices diverge from your own is not that minority sexualities constitute a protected class, that like the color of one’s skin, the angle of one’s wrist is genetic and, goddamnit, queers are people too. It’s simply that fucking is none of your fucking business.