Having sex with an infected person without using condoms, is the behavior that causes AIDS. Genders don't matter; most people contracting AIDS now are heterosexuals in Africa. Many of them have been told, by influential people like the Pope, that it's condoms that cause AIDS, so they are afraid to use them.
Deluding people to think that only male-on-male sex cause AIDS, is going to cause more AIDS cases, asshole! Forcing gays to stay in the closet, where the only outlets were short encounters with strangers, is what started the epidemic. YOUR behavior is the catalyst for this horrible disease.