Opposites attract in relationships
The popular belief that romantic partners with opposite personalities are especially compatible is not well supported by relationship science. Large studies of couples generally find that similarity in values, attitudes, and personality traits predicts relationship satisfaction better than being opposites, though some specific traits show more complex patterns.
What we know
The idea that "opposites attract" in romantic relationships is a long-standing cultural belief, often illustrated through movies and popular narratives pairing mismatched personalities who fall in love. Relationship science has tested this proposition directly by measuring personality similarity between partners and correlating it with relationship satisfaction, longevity, and reported compatibility, and the accumulated evidence generally favors similarity, not difference, as the stronger predictor of successful long-term relationships.
Research on the "similarity-attraction effect," a well replicated finding in social psychology dating to foundational work by psychologist Donn Byrne in the 1960s, shows people are generally more attracted to others who share their attitudes, values, and interests, and that this attraction-through-similarity effect extends into ongoing relationship satisfaction, not just initial attraction. Large-scale studies of married and long-term couples, including research analyzing personality trait similarity using the Big Five personality framework, have found that couples with more similar personality profiles report somewhat higher relationship satisfaction on average than couples with more divergent profiles, although the effect sizes in this research are generally modest rather than large, meaning personality similarity is one contributing factor among many, not an overwhelming predictor on its own.
Some nuance exists in the research that complicates a simple "similarity always wins" framing. Certain trait pairings show more complex patterns: some studies find complementary levels of specific traits, such as one partner being more dominant and the other more accommodating in a specific interaction style, can work well for some couples' dynamics, which is different from a globally "opposite" personality being advantageous. Shared core values, especially around major life issues like finances, child-rearing philosophy, and long-term goals, show some of the most consistent associations with relationship stability in longitudinal research, while surface-level differences in hobbies or minor personality quirks appear to matter far less than the popular narrative suggests, whether framed as similarity or difference.
The "opposites attract" narrative likely persists because dramatic contrast makes for a more compelling story in film and literature than the more mundane reality of compatible values, and because people do sometimes notice and remember specific instances of very different partners who are happy together, which are memorable precisely because they are less common exceptions, a form of selective memory bias that skews perception of how frequently this pattern actually succeeds relative to the more common pattern of value and attitude similarity underlying most stable long-term relationships. Relationship researchers, including those publishing through the Journal of Personality and Social Psychology, generally treat the claim as an oversimplification: attraction to novelty and difference is real and can matter for initial interest, but sustained compatibility tracks values and attitude alignment more reliably than personality opposition. Researchers have also studied why the opposites-attract belief remains so culturally persistent despite the weaker evidence supporting it, suggesting that novelty-seeking during early attraction phases can be misremembered or reinterpreted later as a broader personality contrast once a relationship has become established and comfortable.
Common claims
- People are naturally attracted to those who have opposite personalities.False. Research consistently shows attraction to similar others.
- Complementary roles in a relationship prove opposites attract.Misleading. Role division is compatible with similarity in deeper values and personality.
- The 2023 Nature study confirmed opposites attract.False. The study found the opposite: no compelling evidence for dissimilarity effects.
Evidence hierarchy
All sources
- American Psychological Association resources on relationship compatibility researchAmerican Psychological Association · 2022
- Personality similarity and relationship satisfaction researchJournal of Personality · 2019
- The Attraction ParadigmDonn Byrne, Academic Press · 1971
- Similarity-attraction effectWikipedia · 2024