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geosocial networking dating apps gsn apps increasingly widespread technology used populations throughout world facilitate sexual encounters studies variety settings suggest possible association gsn app use hiv risk behaviors including among sexual gender minority populations men sex men msm transgender women tw however remains unclear extent gsn apps play causal role explored relationship gsn app use sexual risk behaviors among msm tw lima peru analyzing data multisite crosssectional survey assessing general partnerspecific sexual behaviors performed bivariate analysis estimate association gsn app use different individual partnerspecific factors fit multivariable regression models adjusting age education among 741 total participants 698 msm 43 tw 64 met least one sex partner prior three months using gsn app gsn app users significantly likely report engaging hiv risk behaviors general including condomless receptive anal sex group sex transactional sex sex influence alcohol drugs condomless anal sex given partner associated meeting partner via gsn app findings highlight gsn app users particularly vulnerable subpopulation among msm tw lima gsn apps could provide useful vehicle targeted hiv prevention efforts priority populations peru