Background: Research on sexual minorities has consistently shown that exposure to normative views and values (e.g., heteronormativity) increases the risk of developing internalized negativity and experiencing worse psychological outcomes and well-being. Given normative expectations often imposed through socialization in most Western societies (i.e., mononormativity), a similar phenomenon occurs among people in consensually non-monogamous (CNM) relationships. For example, CNM people who endorsed more mononormative beliefs were found to report more internalized CNM negativity, self-stigmatization, and partner stigmatization. Social support from close others has been shown to benefit people who are struggling with external strains and pressures (e.g., economic hardships). Method: Hence, we examined if the support received from members of the close network (i.e., friends and family) also buffers against the consequences of internalized CNM negativity. We conducted a cross-sectional online study with a community sample of CNM individuals from over 30 countries. Results: Replicating recent evidence, participants who reported more internalized CNM negativity also reported worse relationship outcomes with the primary partner, including worse relationship quality, less perceived partner responsiveness in sex, and more sexual distress. Moderation analyses additionally showed that some of these consequences were reported only by participants who perceived to have less (but not more) social support. Conclusions: Our findings show the importance of social support and integration when having to deal with the pressures imposed in mononormative societies.

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• Psychology - Social Sciences