One exception is the "down low" phenomenon among African Americans. In those cases, it is usually closeted gay men passing it on to their girlfriends, as the social stigma against homosexuality is much higher among blacks than it is among whites.
Actually most African American AIDS is associated with IV drug use. It turns out that it's nearly impossible for a healthy woman to contract AIDS from vaginal intercourse.
(Likewise 'heterosexual AIDS' in Africa is almost all attributable to shared medical equipment, both in clinics and home use, and improper sterilization.)
That is still a small proportion. It always comes down to behavior. Many would like to attribute it to socio-economic factors (so they can blame the guvmint and whites) to explain away low testing and awareness rates etc. But when you have a higher proportion of the black population in and out of prison(very high risk) and a higher proportion of unmarried women with a multiple boyfriends, among other issues, you're going to have higher infection rates.
One exception is the "down low" phenomenon among African Americans. In those cases, it is usually closeted gay men passing it on to their girlfriends, as the social stigma against homosexuality is much higher among blacks than it is among whites.
Worse than the klu klux klan?