I wouldn't be surprised if it boiled down to three things: 1) HIV is more easily transmitted man-to-man or woman-to-man than it is man-to-woman or woman-to-wom

I wouldn't be surprised if it boiled down to three things: 1) HIV is more easily transmitted man-to-man or woman-to-man than it is man-to-woman or woman-to-woman. Thus, all else being equal, men are more likely than women to get HIV, and therefore AIDS. 2) For various historical and political reasons, race and class are closely correlated in the US. Black men are more likely to be poor than white men. 3) Poor people are much less likely to have access to condoms and be educated about safe sex, and are more likely to use street drugs and share needles. They're also less likely to have good access to health care, meaning than HIV won't be treated properly and is more likely to progress to AIDS and, eventually, death. Put those three factors together, and you end up with black men having a much higher incidence of AIDS than other groups.