First, let's stick with the US; and second, with respect to men, let's talk about cases per capita:  In 2015, 26K+ new diagnoses in men who have sexual contact with other men; 8K+ for heterosexuals who engage in behaviors with partners with AIDS or at high-risk for HIV.  https://www.cdc.gov/hiv/statistics/overview/index.html

I think lesbians have a whole different set of issues from "gay" men.