Assortative mating and the dark triad: Evidence from the UK, Fiji, and meta-analytic review

The ‘dark triad’ represents the socially aversive personality traits of Machiavellianism, subclinical narcissism (henceforth, ‘narcissim’), and subclinical psychopathy (henceforth, ‘psychopathy’). There is evidence of assortative mating suggesting romantic partners are more similar than chance for these traits at the start of relationships (initial assortment) and not becoming alike with time (convergence), that people seek out partners to whom they are similar (active assortment), and that partner resemblance is not explained by social stratification processes (social homogamy). As the literature relates primarily to Eastern European and North American populations, we present studies from the UK ( N = 104 couples) and Fiji ( N = 99 couples). These showed significant positive assortment for each dark triad trait (other than psychopathy in the Fijian sample), and suggest the effects are explained by initial and active assortment and not by convergence or social homogamy. We also submitted the literature to meta-analytic review (Machiavellianism: k = 10, N = 1302; narcissism: k = 14, N = 1645; psychopathy: k = 13, N = 1989) and observed positive within-couple correlations of small (narcissism, psychopathy) to medium (Machiavellianism) effect size for each of the dark triad traits. • Assortative mating results in greater than chance similarity in romantic partners. • This process may occur for the dark triad of Machiavellianism, subclinical narcissism, and subclinical psychopathy. • Study 1 demonstrates couple similarity for the dark triad in a UK sample. • Study 2 broadly replicates these findings in a sample from Fiji. • Study 3 demonstrates robust couple similarity effects at the meta-analytic level.