But that is not scientific evidence?
As for the source http://en.wikipedia.org/wiki/Biology_and_sexual_orientation#Biological_differences_in_gay_men_and_lesbians
not only does it not prove that sexual preference is genetic but it seems quite plausible for me to be introduced to homosexuality with the right amount of stimuli and varying factors over a period of time that I could become homo or bi-sexual by choice, according the studies.
Wrong. Very wrong. If becoming homosexual was a choice, most men would have done so already.
If I became a homosexual today, a whole new world of endless willing sex partners would immediately become available. There is an endless supply of men who would let you fuck them in the ass if you let them fuck you in yours.
The problem is, I'm only attracted to women. I can't help it.
Sure, I've been successful in having sex with many women, but there are many many more women that I wish I could have sex with that I will never get to have sex with.
Put it this way. If I had a choice to either find 100 willing sex partners in one week(and I wasn't allowed to pay them), or get tortured to death, it would be better for me to focus all my efforts toward the homosexual male population.
Furthermore, I never had the desire to have butt sex with women, let alone men. I can't choose otherwise. I don't like garlic or onions on my vanilla ice cream. I can't choose otherwise. Sure, preferences can change ever time, but things like sexuality cannot.
Also, if you're homosexual, you won't have to worry about getting someone's asshole pregnant.
EDIT: WTF? System would let me type "butt sex", but wouldn't allow for the most popular term. It took me forever to find the "culprit".