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Yeah I think ethnicity is passed on from the parents while sexuality is something that may or may not change in certain ways during the pregnancy itself. Although like Slimebeast said, there are genetic clues, but no gay gene yet.

Either way, I think discussions like this are just kinda insulting, because a conclusion in either direction won't change my mind. They're humans, they're normal, and they deserve equal rights. They're gay and they're here to stay. The question shouldn't be "why are they gay?" but rather, "now what?" And the answer is... "give them equal rights."