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In 2017 in the USA, gay and bisexual men accounted for 66% (25,748) of all HIV diagnoses and 82% of diagnoses among males. It estimated the risk of HIV transmission through receptive vaginal sex (receiving the penis in the vagina) to be 0.08% (equivalent to 1 transmission per 1,250 exposures).
In 1980, a study in the American journal of epidemiology showed that homosexual men were significantly (p < 0.001) more likely than heterosexual men to have gonorrhea (30.31% vs. 19.83%), early syphilis (1.08% vs. 0.34%) and anal warts (2.90% vs. 0.26%) but less likely to have nongonococcal urethritis (NGU) (14.63% vs. 36.40%, p < 0.001), herpes genitalis (0.93% vs. 3.65%, p < 0.001), pediculosis pubis (4.30% vs. 5.35%, p < 0.005), scabies (0.42% vs. 0.76%, p < 0.02), and genital warts (1.68% vs. 6.69%, p < 0.001). In most cases the differences in rates remained significant (p < 0.05) when corrected for age and race. It is speculated that higher rates of gonorrhea and syphilis result from a larger mean number of sexual contacts, more potential sites of infection, and more hidden and asymptomatic disease, while the lower rates of the other STD result from a lesser susceptibility of anal mucosa to the causative agent(s) of NGU, herpes genitalis, and venereal warts or from a lack of pubic apposition (pediculosis pubis).
