AIDS spead in the gay community in north america at first. That is not where it started. To focus on that is to miss something important.
There is no hint that it "started" in any connection to sex actually. No one hints that any one had sex with monkeys. It is the eating of bush meat that probably helped it jump the species barrier.
We are talking about the spread of it. I don't have any idea how the spread occured orginally in Africa but since it has been uncovered it has been an "equal opportunity disease" and cerainly a heterosexual one. So it is reasonable to suppose that it's initial spread was hetrosexually.
The fact that it spread, in North America, first in the gay community is an indictment of careless, promiscuous sex not homosexuality per se. The focus on it as a gay disease is somesort of obession with fundamentalists.
If it was god's punishment I would expect that straights would be somehow immune. That seems resonable to me. But i guess perhaps God intended that and messed up the details of the design. That's not surprising since s/he has seemed to be a "big picture" sort from way back.