Given that people of all races -- and locations -- are subject to the same laws of physics, I've long suspected that we weren't being told the whole story on the African AIDS crisis.

Yup:

Ninety-nine percent of AIDS and HIV cases in Africa come from sexual transmission, virtually all heterosexual. So says the World Health Organization, with other agencies toeing the line. Massive condom airdrops accompanied by a persuasive propaganda campaign would practically make the epidemic vanish overnight. Or would it?

A determined renegade group of three [reputable] scientists has fought for years – with little success – to get out the message that no more than a third of HIV transmission in Africa is from sexual intercourse and most of that is anal. By ignoring the real vectors, they say, we’re sacrificing literally millions of people...

The chief reason it’s so hard to spread HIV vaginally is that, as biopsies of vaginal and cervical tissue show, the virus is unable to penetrate or infect healthy vaginal or cervical tissue.

And there's this further evidence of hidden behavior:

German anthropologist Kurt Falk reported in the 1920s that bisexuality was almost universal among the male populations of African tribes he studied. Medical records also show that African men who insist they’re straighter than the proverbial arrow often suffer transmissible anorectal diseases.

The article speculates puncture wounds could be an even more significant source of infection.

Hat tip and thanks to John Ray.