Even if you are in a committed relationship and can trust that your partner is not being exposed to HIV, you should still be tested before having unprotected sex if either of you had any chance of exposure to HIV in the past. Surveys have found that more than one in five gay men in urban cities are HIV positive, and the virus is more prevalent among MSM of color and certain communities. Americans really want to know their HIV risk during fellatio—even more so than during anal sex. Of course, these numbers will vary based on correct and consistent use of the prevention strategy. PrEP can provide a high level of protection against HIV, but is most effective when used with condoms. We have to take risks every day.
Anal sex is the most risky because the lining of the anus is more delicate than the lining of the vagina and is more easily damaged.
Global information and education on HIV and AIDS