http://www.salon.com/wires/ap/world/2009/07/09/D99B4V980_af_south_africa_rape/index.html

Interesting potential for interaction between culture
and genetics here. If there's a genetic link to rape
behavior, then a culture that tolerates it will see those genes propogate in the population. And vice-versa,
A culture that does not
tolerate it (and punishes in a way decreasing the fitness
of the rapist (or victim, actually)) will decrease that genome.

Combined with a cultural tolerancy for multiple partners, its clear that africa is one big incubator. Yet some (paranoids) think the West came up with HIV.