Do Opposites Attract? — What the Research Actually Finds
Last reviewed by the Men Women Psychology editorial team.
The evidence
What the research actually shows
A large body of research points toward similarity, not opposition, as the stronger force in attraction. Montoya and Horton (2013) conducted a meta-analytic review of the similarity-attraction effect and found consistent evidence that perceived similarity in attitudes and values predicts liking. The effect is robust across many studies, while support for opposites attracting is comparatively thin.
Part of why similarity works is familiarity. Zajonc (1968) demonstrated the mere-exposure effect: people tend to develop more positive feelings toward things — and people — they encounter repeatedly. Similar others often feel familiar and easy to be around, which can smooth the path toward attraction and reduce the friction that sharp differences sometimes create.
The 'opposites attract' idea usually refers to complementarity — the notion that differences fit together like puzzle pieces. Research suggests genuine complementarity plays a modest role at best, and mainly in specific domains rather than as a general rule. Studies more often find that couples resemble each other on key dimensions like values and outlook, and that this resemblance is associated with greater satisfaction. These patterns hold broadly across genders.
The mechanism
Why this happens
Similarity is rewarding for several reasons. When someone shares your views, it tends to validate your sense of reality and reduce conflict over fundamental matters. Agreement feels affirming, and shared interests create natural opportunities to spend time together, which through repeated positive contact can deepen liking — a link consistent with the mere-exposure effect.
Familiarity also lowers uncertainty. People who are similar to us are often easier to predict and understand, which can make interactions feel safer and more comfortable. From an attachment perspective, that sense of ease and predictability supports the gradual building of closeness, whereas constant fundamental difference can keep a relationship feeling effortful.
Where differences do help, they tend to be specific and complementary rather than total opposition. A pairing of, say, someone who likes to plan and someone more spontaneous can balance each other on a shared foundation of common values. The differences work because the core compatibility is already there, not in spite of an absence of it.
In practice
What this looks like in real life
Two people discover they share similar values about family, money, and how to treat others, and the relationship feels easy from early on. They may describe this as 'just clicking,' which often reflects underlying similarity rather than a mysterious chemistry between opposites.
A couple seems different on the surface — one outgoing, one reserved — and they describe themselves as proof that opposites attract. On closer look, they usually share the deeper things that matter most to them, and their differences sit on top of a compatible foundation rather than defining the relationship.
An intense early attraction to someone very different can fade once the novelty wears off and the practical friction of mismatched values appears. What felt exciting at first — the sense of someone from a different world — can become a source of recurring conflict when core priorities don't align.
Myth vs. evidence
What most people get wrong about this
The biggest misconception is taking 'opposites attract' as a general rule for relationships. Research suggests the opposite is closer to the truth for most enduring attraction: similarity in values and attitudes is the stronger and more reliable predictor. The saying captures the appeal of novelty better than it describes what sustains a bond.
People also sometimes confuse surface differences with deep ones. A couple can differ in hobbies, energy levels, or personality style while sharing the values and goals that actually carry a relationship. Mistaking that for true opposition can lead people to either overrate clashes or assume a difference is fatal when it may simply be complementary.
Why it matters
What this means for relationships
When evaluating compatibility, the research suggests paying particular attention to alignment on core values, life goals, and how each person treats others, rather than worrying about every difference in taste or temperament. Shared fundamentals tend to predict satisfaction more than matched hobbies do.
Differences are not the enemy. The healthiest approach is often to value the ways a partner complements you while ensuring the foundation underneath is genuinely similar. Curiosity about a partner's differences, paired with agreement on what matters most, tends to serve a relationship better than seeking either a clone or a true opposite.
Where it varies
The nuance
These findings describe general tendencies, not guarantees, and they apply broadly to both men and women. Janet Hyde's gender similarities hypothesis (2005) underscores that the sexes are far more alike than different on most psychological measures, and the pull toward similarity in attraction appears to operate for people generally rather than along gender lines.
Individuals vary, and there are real relationships in which notable differences thrive. What the research suggests is a base rate, not a verdict on any specific couple. Personality, life stage, and the particular dimensions on which two people are similar or different all shape how much any given difference helps or hinders.
Questions people ask about this
Do opposites really attract?
Research suggests not, at least not as a general rule. Studies on the similarity-attraction effect consistently find people are drawn to those who share their values and attitudes. The appeal of pure opposites tends to be weak and often short-lived, so similarity is generally the stronger force.
Why does the idea that opposites attract feel true?
It captures the novelty and excitement that differences can bring early on, which can be genuinely appealing. Memorable couples who seem very different also stand out. But on closer look, such couples usually share deeper values, and surface differences are not the same as fundamental opposition.
Can differences ever strengthen a relationship?
Yes, in a complementary way. Differences in style — such as planner and improviser — can balance a couple when they sit on a foundation of shared values. Research suggests complementarity plays a modest role and tends to work best alongside strong underlying similarity, not in place of it.
What kind of similarity matters most?
Research points to similarity in attitudes, values, and outlook as especially important, more so than matching hobbies or personality style. Alignment on how to live, what to prioritize, and how to treat others tends to predict liking and satisfaction more reliably than surface-level sameness.
Is it a problem if my partner and I are very different?
Not necessarily. It depends on where the differences lie. Differences in taste or temperament are often manageable and can even be complementary. Differences in core values and life goals tend to create more friction, so it can help to look at whether your fundamentals align beneath the surface differences.
Do men and women differ in being drawn to similarity?
On average the pull toward similarity appears broadly similar across genders, with heavy overlap between individuals. Hyde's gender similarities hypothesis notes the sexes are more alike than different on most measures, and the similarity-attraction effect seems to apply to people generally.
Research sources
These references point to the published research and established frameworks behind this page. They are provided for further reading; see our research methodology for how sources are selected.
- Montoya, R. M., & Horton, R. S. (2013). A meta-analytic investigation of the processes underlying the similarity-attraction effect. Journal of Social and Personal Relationships, 30(1), 64–94.
- Zajonc, R. B. (1968). Attitudinal effects of mere exposure. Journal of Personality and Social Psychology, 9(2, Pt.2), 1–27.
- Hyde, J. S. (2005). The gender similarities hypothesis. American Psychologist, 60(6), 581–592.