This is demonstrably not true. The odds of a man getting HIV from an infected woman are something on the order of 500-1 per encounter. The odds of a man getting it from an infected man are closer to 3-1. The odds of a woman getting it from an infected man are about 50-1.
AiDS may have began with homosexuals, but no longer is it the only way to get it.
I never said it was the only way to get AIDS. However, there is no "better" way to spread it than through male homosexuality, not by several orders of magnitude.
1) Why should chastity be more difficult for homos than for heteros? I was chaste for many years. Granted I would have preferred otherwise. But my world did not revolve around the chastity, nor around the lack of it when that occurred. Apart from gay-straight, Why do some think that the world should revolve around that single chastity aspect when life could be very complex with hundreds of other reference points?
2) AIDS just as easily Studies have consistently shown that heterosexuals, and especially heterosexual female prostitutes, who engage in anal sex have a much higher incidence of HIV and AIDS than others with the same promiscuity limited to oral sex and normal sex.
Yes, HIV/AIDS can be transmitted by the exchange of any body fluid. But the odds are astronomically higher with one particular means that nature considers unsanitary.
You didn't mention the odds of a woman getting HIV from a woman, which I believe are far lower still.