People tend to form partnerships with others who are similar to themselves. A new meta-analysis examines correlations between human mating partners, and finds correlations across nearly every trait studied. Education, social attitudes and substance use showed the highest correlations. Effect sizes differed between studies, suggesting potential cultural contingency.
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Willems, Y.E., Raffington, L. Trait correlations in human couples. Nat Hum Behav 7, 1420–1421 (2023). https://doi.org/10.1038/s41562-023-01673-y