Want a hyper-epidemic? All you need is a tradition of polygamy AND high levels of female autonomy. Big Men have their little network of wives and/or lovers. Women buy in to duty sex for the status and security, but get to run their own little networks on the side, for the fun of it. That has been the pattern in South Africa, Swaziland, Botswana, Zambia, Zimbabwe and a number of other countries where more than one adult in seven has HIV.

But woe betide anyone who points this out. At best, you are insensitive to cultural traditions. At worst, you are perpetuating racist myths of the hypersexualised African male, blah, blah, blah.