Quoted:
Chosen lifestyle choice.
All sex, all STDs all the time.
I've heard of gay people actively having sex with other gays with AIDS so they could get AIDS and get it over with.
CRC
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You don't "get" AIDS, but you do get HIV. AIDS is a disease (or series of diseases) that could take 10 or more years to develop. Nowadays, HIV positive men are are living for 15 or 20 years past the date of infection with HIV.
Not exactly the quickest way to "get it over with."
I'd opine that it's mostly genetic. Just ask anyone with more than one kid what they think about how their kids come to be who they are. They'll tell you that they come out a certain way, with a certain personality, and other seemingly fixed characteristics almost from the moment they are born.
Sure we mold them, but not always a whole lot.