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Transgender women—individuals assigned a male sex at birth who identify as women, female, or on the male-to-female (MTF) trans feminine spectrum—are at high-risk of HIV worldwide. Prior research has suggested that transgender women more frequently engage in condomless sex with primary cisgender (i.e. non-transgender) male partners compared with casual or paying partners, and that condomless sex in this context might be motivated by relationship dynamics such as trust and intimacy. The current study examined sexual agreement types and motivations as factors thatshape HIV risk behaviors in a community sample of 191 transgender women and their cisgenderprimary male partners who completed a cross-sectional survey. Overall, 40% of couples had monogamous, 15% open, and 45% discrepant sexual agreements (i.e., partners disagreed on their type of agreement). Actor-partner interdependence models (APIM) were fit to examine the influence of sexual agreement type and motivations on extra-dyadic HIV risk (i.e., condomless sex with outside partners) and intra-dyadic HIV serodiscordant risk (i.e., condomless sex with serodiscordant primary partners). Formale partners, extra-dyadic risk was associated with their own and their partners' sexual agreement motives, and male partners who engaged in extra-dyadic HIV risk had an increased odds of engaging in HIV serodiscordant intra-dyadic risk. Study findings supportinclusion ofthe male partners of transgender women into HIV prevention efforts. Future research is warranted to explore the interpersonal and social contexts of sexual agreement types and motivations in relationships between transgender women and their male partners to develop interventions that meet their unique HIV prevention needs.