I play racquetball with a urologist, and I asked him about this - why does Africa have such a higher rate of AIDS with women. He mentioned the circumcision effect. In fact, he spent a few months in Africa setting up circuncision education centers.
I just ran into an article saying that 40 thousand men in Zimbabwe had been circumcized.
That will help, as will “safe sex” for sex workers, and the fact that many men are using mistresses instead of one night stands.