Do Opposites Attract? What the Research Says
Entry No. 167 ·
By The IF Team
Mostly, no. Across decades of research, people tend to be attracted to, and to end up with, partners who are like them, especially in values, beliefs, education and habits. A large 2023 analysis of partner data found couples were more alike than chance on the great majority of traits, and no compelling evidence that opposites attract on any of them. Where difference does seem to help, it is narrower than the saying suggests: in one study, the happiest couples were alike in warmth but different in how much each liked to take charge. Similar at the core and different around the edges is the pattern that holds up.
None of which stops people falling for someone from another world entirely, and that kind of feeling often turns up with awkward timing. IF lets you say how you feel honestly, single or not, and whoever has caught your attention: a feeling that began at a party or on a course goes into a sealed IF, to be acted on once the timing allows. More on that later. First, why the idea of opposites is so appealing.
Why we want opposites to attract
The saying survives because it describes a feeling most people recognise. Someone unlike you can be thrilling: they notice things you miss, enjoy things you never tried, and make your own habits look new. Psychologists have a name for part of this pull, self-expansion — the pleasure of a partner who adds new experiences, skills and ways of seeing to your life.
Stories help, too. The grumpy one and the sunny one, the planner and the free spirit, the rivals who bicker their way to a kiss: fiction loves a pairing built on contrast, and enemies-to-lovers is one of the most popular arcs there is. And in daily life, difference can be practical. One of you cooks and the other does the admin; one of you is good at parties and the other is good at leaving them.
What the research shows: birds of a feather
When researchers at the University of Colorado Boulder combined nearly two hundred earlier studies with a fresh analysis of more than a hundred traits in a large British sample of couples, partners were more likely to be similar than different on somewhere between 82 and 89 per cent of the traits they examined. On only a handful did partners lean the other way, and only weakly.
The similarity was strongest for core values and beliefs, education and habits such as drinking and smoking. It was weakest for personality: how outgoing two partners were, for instance, matched only slightly. That pattern is telling. Couples, it seems, are most alike in what they believe and how they live, and much less alike in temperament.
Feeling alike matters more than being alike
There is a subtler finding underneath. A review of hundreds of studies separated actual similarity — how alike two people really are — from perceived similarity, how alike they feel. Actual similarity predicted attraction between people who had never met, or had only just met, but not within existing relationships. Feeling similar mattered at every stage.
In other words, a couple can differ on paper and still feel deeply alike — the same sense of humour, the same idea of a good Sunday, the feeling of being understood without having to explain. That felt kinship is what most people mean when they say someone “gets” them, and it is one of the forces set out in the psychology of attraction.
Where difference helps: who takes the lead
The clearest case for complementarity concerns one particular kind of difference. In a study of romantic ideals and real couples, people said they wanted partners similar to themselves, but the couples who were happiest were alike in warmth and different in dominance. Both were kind, affectionate and considerate; one was simply more inclined to take charge.
It makes intuitive sense. Two warm people who both want to steer every decision can end up in a tug of war, while two who both wait for the other to choose can end up eating cereal for dinner. A partner who is happy to lead when you would rather follow, and to follow when you know best, makes everyday life smoother. The roles need not be fixed, either. Plenty of couples split them by territory: one leads on travel, the other on money.
Why matching personalities is overrated
If you have ever wondered whether two introverts, or an introvert and an extrovert, are a better bet, the research offers some relief. In large national samples of couples in Australia, the United Kingdom and Germany, each partner’s own personality, and the other partner’s, predicted how satisfied they were, but how similar their personalities were added little or nothing beyond that.
So the question is less “are we alike?” than “are we each good to be with?” Someone kind, steady and generous will usually be easier to love than someone who merely shares your temperament. If you are the quieter one, dating as an introvert has more on finding a rhythm with someone more social. And if you keep being drawn to the same kind of person, alike or not, why you have a type explores the pattern.
Differences that work, and differences that wear
Most couples are a mix of the two. The useful skill is telling them apart.
Usually workable
- Energy and sociability: one of you recharges at home, the other at a crowded table, and with goodwill you take turns.
- Interests and tastes: different music, films and hobbies give you things to bring each other.
- Skills and roles: the planner and the improviser, the cook and the person who happily does the washing-up.
- Background and culture: a source of richness when both of you are curious about the other’s world.
Usually harder
- Core values: honesty, how you treat people, what you each think is right.
- Life direction: children or not, where to live, how you each picture the next ten years.
- Money: one saver and one spender can work, but only if you agree on the rules.
- What you want from the relationship itself: commitment, exclusivity and how fast to move.
If you are unsure which kind of difference you are facing, ask whether it is about taste or about direction. Taste can be shared, traded or enjoyed from a distance. Direction usually has to be agreed. Chemistry versus compatibility goes further into reading both early on.
Making a relationship of opposites work
- Be curious, not corrective. “How did you get so good at that?” builds closeness; “why are you like this?” does the opposite.
- Agree on the big things first, and let the small differences be the fun part.
- Trade turns. Your friend’s birthday this weekend, my quiet night in next.
- Let each of you lead where you are stronger, and say thank you when the other does.
- Watch for contempt. Teasing about a difference is affectionate until it becomes an eye-roll; if that happens, talk about it.
Where IF fits: when your opposite lives in a different world
Sometimes the person who intrigues you most is the least like anyone you have dated: a friend of a friend from a different scene, someone from another team at work, the person you got talking to on a course. Difference has a habit of sneaking up on you, and it rarely checks first whether either of you is single.
If they are taken, or you are, the feeling is still honest and nothing to hide. Cheating would cross a line, and so would lying; telling them face to face would not, but it drops the feeling into the middle of their life, or yours, with no way to take it back. An IF carries it without that pressure. It is sealed, it holds up to 250 characters, and you can send it through Swipe, or through Search with a handle, email address or phone number they gave you. They might get word that an IF is waiting; whose it is and what it says remain sealed until a reveal. For someone not yet on IF, an email address earns one brief invitation, and a phone number or handle earns nothing at all, so the IF can wait quietly in case they ever join.
While either of you has a partner, IF opens nothing between you, and there is no back and forth to be had. Once you are both single, the IF can be revealed and they choose whether to accept, which opens a chat. If you are both single already and they are on IF, a Like is all you need, and a chat begins when they accept it. Your first IF is free.
Questions people ask
Do opposites attract in friendships?
Much the same pattern holds: friends tend to resemble each other in values, interests and outlook, partly because you meet people like yourself and partly because you warm to them faster. Friendships between very different people can be wonderful, but they usually rest on something important you share.
Is it better to date someone similar to you or different?
Similar where it counts — values, life direction, how you treat each other — and as different as you like everywhere else. Matching hobbies matter far less than people think. Feeling understood matters far more.
Why am I attracted to people who are nothing like me?
Novelty is exciting, someone different can widen your world, and a person who has what you lack can be easy to admire. None of that is a problem. The useful question is whether, underneath the difference, you want the same things from life and from each other.
Alike or not, the feeling is yours to be honest about. If they are someone you cannot date yet, say it in an IF and give the difference time to become something.