Do relationships provide the same levels of protection against heavy drinking for lesbian and bisexual women? An intersectional approach.

Purpose Sexual minority women (SMW; e.g., lesbian, bisexual) are more likely than heterosexual women to be heavy drinkers, with bisexual women showing the highest risk. There is ample literature demonstrating that intimate relationships protect against stress-related health risk behaviors in the general population. However, very little research has focused on SMW's relationships and far less is known about the relationships of SMW of color. Using intersectionality theory as our framework, we tested two competing models to determine whether the effects of minority sexual identity (lesbian, bisexual) and race/ethnicity (African American, Latinx, White) are: 1) additive, or 2) multiplicative in the associations between relationship status and heavy drinking. Methods Data are from a diverse sample of cisgender sexual minority women (N = 641) interviewed in Wave 3 of the CHLEW study, a 20-year longitudinal study of SMW's health. Results Findings from two- and three-way interactions provide mixed evidence for both the additive and multiplicative hypotheses; support for each varied by sexual identity and race/ethnicity. Overall, we found that Latinx SMW, particularly single and bisexual Latinx SMW report the highest rates of heavy drinking compared to their cohabiting and lesbian counterparts, respectively. African American single SMW reported significantly higher rates of heavy drinking compared to their cohabiting counterparts. Conclusion Our findings suggest that the protective qualities of SMW's intimate relationships vary based on sexual identity and race/ethnicity-and the intersections between them. These results highlight that research among SMW that does not take into account multiple marginalized identities may obscure differences. Public Significance Little research has focused on health within sexual minority women's relationships, particularly among sexual minority women of color. Given the potential additive or multiplicative effects of multiple sources of oppression such as heterosexism, racism, and sexism, understanding the potential protective effects of relationships is important. Our findings demonstrate that the protective qualities of intimate relationships among SMW vary based on sexual identity and race/ethnicity - and the intersections between them.