In Africa, widespread homosexuality, widespread anal sex due to a lot of reasons including female circumcision and dirty, re-used needles used for vaccinations and other "health" purposes.
"WHY IS HIV SO PREVALENT IN AFRICA?
BY MICHAEL FUMENTO
Tech Central Station, April 15, 2005
Copyright 2005 Tech Central Station
"...Yet almost certainly greater – and more controllable – contributors to the African epidemic are "contaminated punctures from such sources as medical injections, dental injections, surgical procedures, drawing as well as injecting blood, and rehydration through IV tubes," says Brody.
You don’t even need to go to a clinic to be injected with HIV: Almost two-thirds of 360 homes visited in sub-Saharan Africa had medical injection equipment that was apparently shared by family members. This, says Brody, can explain why both a husband and wife will be infected.
For those who care to look, there are many indicators that punctures play a huge role in the spread of disease. For example, during the 1990s HIV increased in Zimbabwe at approximately 12 percent annually, even as condom use increased and sexually transmitted infections rapidly fell."
http://fumento.com/aids/aids2005.html