45%
Relationship-specific factors such as appreciation, commitment, conflict and sexual satisfaction explained up to 45% of the differences in relationship quality, against 21% for individual traits. Across 43 studies of couples.
Source: Joel et al., 2020, PNAS
23,250
In a study of this many people in Australia, the UK and Germany, similarity in personality added little. What each person brings, and how they treat each other, mattered more.
Source: Dyrenforth et al., 2010, J Pers Soc Psychol
85 years
The Harvard Study of Adult Development, begun in 1938, found satisfaction in relationships, especially marriage, was the best predictor of who would be happy and healthy at 80, ahead of midlife cholesterol.
Source: Harvard Gazette, 2023
Looks
In speed dating, looks drew interest in the moment, but what people said they wanted in a partner did not predict who they actually liked. Ideal lists are a poor guide, so we match on how people really relate.
Source: Eastwick and Finkel, 2008, J Pers Soc Psychol
Research shows what tends to predict satisfied couples. It cannot promise an outcome for any one person. Physical attraction is real and we include it, but it does not decide who you meet.