[BackFromTheBrink]

Just to add my little bit to this discussion. As far as I know, in the early days of the AIDS epidemic in Sub-Saharan Africa it was almost entirely a homosexual disease. Only later did the virus spread to a larger portion of the population and eventually become mostly a heterosexual problem.

[Lorianne]

I haven't heard that. From what I've read it went from primates to humans sometimes around 1950, probably from people eating monkeys, or perhaps some other interaction (that we don't want to think about).

I think it's been a heterosexual disease from the get-go, until it got to the West.