Homosexuality

[SPC]

Where's Other/Both? Obviously there are components of both that determine whether one becomes homosexual or not; if it weren't, the frequency of one's identical twin being homosexual given that one is homosexual would be closer to 100% (if it were entirely genetic) or 10% (if it were entirely environmental/lifestyle choice), rather than the actual value of approximately 50%. While the advocates of genetically-determined sexuality certainly have a point with the examples of homosexuality elsewhere in the animal kingdom, are we supposed to believe that there was just something different (one might even say queer) in the gene pool in Ancient Greece?

[SPC]

Neither. It's obviously not genetic, because a "gay" gene would die out rather quickly. And there's not much evidence to say that its a lifestyle choice.

Nah, not that simple, passive genes can be passed on.

True, but anytime someone got two copies of the gene, they wouldn't have offspring, and slowly but surely, the gene would die out. Unless the gene is from a relatively recent mutation, I don't see any way there could be a gay gene. I think homosexuality is most likely caused by something that happens in the womb, which in fact my psychology teacher mentioned is one of the current leading theories on the cause of homosexuality.

That's why Tay-Sachs was eradicated, right?