religious people think homosexuality is a choice, so forcing a gay man to marry a woman makes him not gay.  its really that simple. if any of your studies were correct, religious people would be using these genetic or biological markers to identify gay people.  the simple fact of the matter is that the distinction between homosexual and heterosexual is a modern phenomenon, and does not have any basis in genetics or biology.  its entirely social, just like third genders in parts of asia. you should never underestimate the power culture has in influencing behavior.
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