Variations in patterns of sexual risk behavior among Seattle-area MSM based on their HIV status, the HIV status of their partner and partner type.

We evaluated sexual risk behavior in 368 Seattle-area MSM recruited in the 2008 National HIV Behavioral Surveillance survey. We found significant concordance between participants' self-reported HIV status and that of their sexual partners. Persons unaware of partners' HIV status were more likely to report only oral sex. Those aware were less likely to report non-concordant unprotected anal intercourse (UAI). Participants reporting themselves HIV-positive were more likely than those self-reporting HIV-negative status to report non-concordant UAI and several other sexual risk behaviors. The level of non-concordant UAI did not materially differ by whether their partner was a main or casual partner.