In the US, homosexual men have a 1 out of 7 chance (14.25%) of having AIDS. The chance of getting AIDS from heterosexual transmission is .0005%. HIV/AIDS Statistics
Most of that is via anal sex... In addition, these stats are based on what the infected men say. Admitting to being gay has a stigma, drugs are illegal... so, the easy way out is to say they got it from a hooker