P509 Use of internet/mobile dating apps to find sex partners among a nationally representative sample of men who have sex with men

Background Associations between online sex seeking and increased risk for STDs and HIV among men who have sex with men (MSM) typically rely on convenience samples. We examined the prevalence of internet and mobile app use for finding sex partners among a nationally representative sample of MSM. Methods We analyzed 2011–2017 data from the National Survey of Family Growth, a nationally representative sample of the civilian, non-institutionalized US population (15–44 years). The analytic sample was comprised of males who reported one or more same-sex partners in the past year. We also assessed associations between online sex-seeking and STD risk, sexual health service use, and condom use. Results Of 13,320 male respondents, 442 (3.0%) reported sex with a man in the past year, of whom 227 (53.7%) had met a partner online. Between MSM who met partners online and those who did not, we found no differences by age, education, race/ethnicity or socioeconomic status. MSM with online partners were more likely to identify as gay (69.5% vs 49.4%, p Conclusion MSM who report using online sources to find sex partners are more likely than other MSM to report behaviors that increase risk for STD/HIV, but are also more likely to engage in behaviors that may mitigate risk, such as STD testing. Disclosure No significant relationships.