Quick question: Did the flyers actually say "homosexuals?" Forgive me for being a stickler, but they typically refer to "men who have sex with men" and/or "gay and bisexual men."
You might be surprised to learn that San Francisco did not make the list of top 10 US cities by HIV infection rate (it was #21) published by HIV Plus magazine. Additionally, you might be surprised that California, New York, and Illinois have a lower rate of HIV infection and individuals in those three states are at a lower risk of infection than individuals are in several Southern states according to the CDC.