Perceived HIV Prevalence Accuracy and Sexual Risk Behavior Among Gay, Bisexual, and Other Men Who Have Sex with Men in the United States.

Interventions that promote HIV prevention and reduce sexual risk-taking among men who have sex with men (MSM) are needed. Decisions surrounding sexual behavior and prevention are in part shaped by how individuals gauge HIV risk, which may be influenced by perceptions of local HIV prevalence. Using an online sample of self-reported HIV-negative adult MSM (n = 1477, mean age = 45) recruited in 2015, we examine associations between accuracy of perceived local HIV prevalence and self-reported condomless anal sex (CAS) and HIV testing. Men who perceived their local HIV prevalence to be higher than actual were more likely to be recently HIV tested and less likely to engage in CAS. Men who estimated their local prevalence to be lower than actual were more likely to engage in CAS and less likely to have recently tested for HIV. Results suggest that how accurately MSM understand their HIV environment may contribute to prevention decisions.