Countering the Monogamy-Superiority Myth: A Meta-Analysis of the Differences in Relationship Satisfaction and Sexual Satisfaction as a Function of Relationship Orientation.

Relationship satisfaction and sexual satisfaction are key predictors of wellbeing and can substantially contribute to quality of life. Assumptions are often made that relationship and sexual satisfaction are heightened for those in monogamous relationship configurations. This meta-analytic review challenges such assumptions by comparing the degree of relationship and sexual satisfaction of monogamous and non-monogamous individuals. A literature search using PsycINFO, PsycARTICLES, PsycEXTRA, CINAHL, LGBT+ Source, and SOCIndex, and an additional call for unpublished data, identified 35 suitable studies (N = 24,489). Meta-analytic results show null effects overall, suggesting that both relationships (k = 29; g = -0.05, 95% CIs [-0.20, 0.10], p = .496) and sex (k = 17; g = 0.06, 95% CIs [-0.07, 0.18], p = .393) are equally satisfactory for monogamous and non-monogamous individuals. Sub-group analyses revealed that these overall effects did not vary according to sampling characteristics (e.g. LGBTQ+ vs. heterosexual samples), non-monogamy agreement types (e.g. open vs. polyamorous vs. monogamish), or relationship satisfaction dimension (e.g. trust vs. commitment vs. intimacy). There was no evidence of publication bias. Methodological challenges and directions for future research are discussed.