I believe that the latest tests have confirmed that "left brain / right brain" activity is different in homosexuals.
As in, women's brain waves are distinctly different from that of men... and thus, homosexual people's brain waves more resemble that of the opposite sex.
I know that doesn't really answer the question of this thread, but I'd imagine that a person's brain activity is only partially set by birth and partially set by upbringing.
For me personally, I tend to believe that a gay person is just gay, and a straight person is just straight. They don't really choose, they just are.
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