Heterosexual cases account for 5% of infections (cumulative) in California. Hetero cases are higher for U.S. average because so many gays have flocked to California.
Of hetro cases, 2/3 are female, and I know from charts I have seen posted (I have a bunch of clients who are medical testing labs) nearly all of those females are black, the only significant rising group in California.
Sticking to my general age group, demographic and ethnicity, I could sleep with a different woman every night for the rest of my life without significantly changing the odds between dying of AIDS versus the Los Angeles freeways.
[link|http://www.apla.org/apla/ed/HIVSTATS.HTM#castats|Stats]