1. Viewing of Internet-Based Sexually Explicit Media as a Risk Factor for Condomless Anal Sex among Men Who Have Sex with Men in Four U.S. Cities Schrimshaw, Eric W.; Antebi-Gruszka, Nadav; Downing Jr., Martin J. 2016 Articles Pornographic filmsGay men--Sexual behaviorCondom useSociologyMedical sciencesPublic health