This article by Emily Oster, brought to my attention by Robert from Creative Destruction, is interesting to me mostly because of what it leaves out.
Namely, the theory that AIDS in Africa is not being spread sexually, but through bad sterile technique when dealing with intravenous medications and vaccinations. And that the cases that are transmitted sexually are transmitted mostly through anal sex (and therefore, most men who contract it sexually do so through homosexual sex).
Read the discussion at Creative Destruction.
That is all.