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Objectives: Ethnic discrimination and acculturative stress play an important role in sexual risk behaviors for Latinx emerging adults, who are at disproportionate risk for sexually transmitted infections. Factors such as familism support and ethnic identity may be protective, yet research is limited. This study is guided by a culturally adapted stress and coping framework to examine associations of ethnic discrimination and acculturative stress with sexual risk behaviors (i.e., multiple sex partners, alcohol or drug use before sex, and condomless sex with a primary or casual partner), and examine the moderating roles of familism support and ethnic identity among Latinx emerging adults. Method: Participants were recruited from Arizona and Florida and were primarily female (51.3%) with a mean age of 21.48 years (SD = 2.06). Using cross-sectional data from 158 sexually active Latinx emerging adults, this study employed multiple logistic regression and moderation analyses. Results: Higher levels of ethnic discrimination and pressure to acculturate were associated with fewer sex partners, and higher levels of pressure against acculturation were associated with increased condomless sex with a casual partner. The moderation effect of higher levels of familism support on pressure to acculturate was associated with fewer sex partners, and the moderation effect of higher levels of ethnic identity on pressure against acculturation was associated with decreased condomless sex with casual partners. Conclusions: Examining the results within a culturally informed theoretical framework supports that protective factors may help mitigate sexual risk factors among Latinx emerging adults experiencing acculturative stress. Public Significance Statement: Ethnic discrimination and acculturative stress can be linked with sexual risk behaviors among Latinx emerging adults. This study found that while ethnic discrimination and pressure to acculturate were linked with fewer sex partners, pressure against acculturation was linked to increased condomless sex with a casual partner. Family support and ethnic identity can be protective in the prevention of sexual risk behaviors among Latinx emerging adults who experience acculturative stress. [ABSTRACT FROM AUTHOR]