According to the self-expansion model, people increase their positive self-concept content when they form and maintain romantic relationships, and self-expansion is an important predictor of relationship outcomes. Although thought to be universal, no prior research has examined self-expansion among sexual minority individuals. In the current study, sexual minority (N = 226) and heterosexual (N = 104) participants completed measures of self-expansion and relationship outcomes, and sexual minority participants completed measures of sexual minority stress. Overall, sexual minorities reported similar levels of self-expansion as heterosexuals, and sexual minority status did not moderate the association between self-expansion and relationship satisfaction, investments, or quality of alternatives. However, sexual minority status moderated the association between self-expansion and commitment. For sexual minority participants, self-expansion negatively correlated with sexual minority stressors (i.e. internalized homonegativity, concealment, inauthenticity) and moderated the association between internalized homonegativity and relationship satisfaction and commitment, as well as concealment and relationship satisfaction and commitment, such that the negative association between sexual minority stressors and relationship outcomes was weaker in relationships characterized by high (vs. low) levels of self-expansion.
Keywords: Investment model; LGBTQ relationships; self-expansion; sexual minority relationships; sexual minority stress.