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It was ill-phrased I guess! Straight people have the tendency to infer the gender of a person based on his sexual orientation. So if someone is attracted to males, he's a female. I was just trying to make clear that even though he's attracted to both sexes, he definitely considers himself to be of one sex and feels no ambivalence about this. I will correct it.

"Straight people have the tendency to infer the gender of a person based on his sexual orientation. "

Sorry that sounds idiotic. Straight people (based on me and everyone else straight I know) have the tendency to infer the gender of a person based on their looks. If e.g. someone looks like a guy I will infer that he probably is a guy. A quick look on his pants will typically verify my assumption. Whether he likes to have sex with women, men, animals, inanimate objects or whatever has nothing to do with his gender.

Of course that's just based on my anecdotal experience, maybe I am wrong. Feel free to counter argue me with published literature.

Ha! No, you're right! That's the first thing a person pays attention to. What I meant is that, in the context of the discussion about someone who let's say is ambiguous about what sex or gender he really is (say, a hermaphrodite), then in that case, if I tell you that Sam is attracted to girls, you will assume that Sam's gender is of a man. That's what would happen if a doctor saw Sam was a hermaphrodite and was trying to advise the parents regarding which sex to raise him as. Many doctors, uninformed (I actually encountered this in the literature!) would just ask Sam who he's attracted to, and if he said "women", they'd give him androgens to make him more male. But, in fact, Sam could be a female who is attracted to other females, like a gay woman who enjoys being a woman.