I think our preferences are established much earlier than when we have our first experiences. That's certainly what they're teaching us in med school, too. Experiences later may strengthen people's leanings in some way, but generally the experts now standardly believe that our proclivities are determined either in utero or within the first two years of life.

I can remember feeling attracted to men even as a very young girl. I think I was wired that way from the get-go. Not everyone may be as aware of those facts, perhaps, and may need later experiences to help wake themselves up about their preferences. But I still think those preferences are largely inherent in us from our earliest youth.