The Psychology of Attraction: Why You Like Who You Like
Entry No. 174 ·
By The IF Team
Why are you attracted to some people and not others? Mostly because of forces that work quietly, long before you notice a crush. You tend to fall for people you cross paths with often (proximity and familiarity), people who seem like you (similarity), people who seem to like you in particular (reciprocity) and, now and then, people who keep you guessing (uncertainty). Looks matter most at first sight and less the better two people know each other. And the pull between two specific people, the thing everyone calls chemistry, turns out to be far harder to predict than any list of traits.
Notice where nearly all of those forces operate: in real life. Attraction grows in lecture halls and offices, in friend groups and on the same morning train, and it does not check anyone’s relationship status before it arrives. That is why we built IF, which lets anyone, single or in a relationship, be honest about who they have feelings for, whoever that turns out to be. The feeling can start anywhere — a seminar, a kitchen at a party, the queue for coffee — and IF holds it until the time is right to act on it. There is more on how that works at the end. First, the psychology.
Proximity: you fall for the people who are near
The most underrated force in attraction is geography. In a classic study of a student housing estate at MIT, friendships formed far more often between near neighbours than between people a few doors apart, and the layout mattered too: residents who lived at the foot of a busy staircase made more friends, simply because more people passed their door. The researchers called it physical and functional distance, and the proximity effect it describes is one of the sturdiest findings in the study of relationships.
Proximity works because it supplies the raw material of attraction: chances to talk, small shared moments and, above all, repetition. Today the corridor might be an open-plan office, a five-a-side team or a group chat, but the principle has not changed. You cannot fall for someone you never encounter, and you are quietly more likely to fall for someone you encounter all the time.
Familiarity: the more you see them, the more you like them
Repetition has an effect of its own. Psychologists call it the mere exposure effect: the more often you encounter something, the more you tend to like it, even when nothing else happens between you. A face you have seen a dozen times feels warmer than one you have seen twice. Familiarity even shades into a sense of kinship: in one study, people rated those they had seen more often as both more likeable and more similar to themselves.
It has limits. More exposure tends to deepen whatever impression you already have, so it helps most when the first one was warm, and too much of the same thing can tip into boredom. Our guide to the mere exposure effect covers the research, and the places where familiarity breeds contempt instead, in full.
Similarity: you are drawn to people who seem like you
Folk wisdom says opposites attract. The research mostly says the reverse: people tend to be drawn to, and to end up with, partners who share their values, beliefs, habits and sense of humour. What seems to matter most is not being alike on paper but feeling alike — laughing at the same things, caring about the same things, feeling understood without having to explain yourself. Whether difference ever helps, and the narrow ways in which it can, is covered in our guide to whether opposites attract.
Similarity also explains a pattern many people notice in themselves: a run of partners who look, talk or behave alike. If you keep falling for the same kind of person, why you have a type looks at what that pattern is made of, and whether it is serving you.
Reciprocity: you like people who like you — specifically
Few things are as attractive as being liked. Discovering that someone is interested in you tends to make you more interested in them, which is why one warm, specific compliment can change how you see a person overnight. But there is a twist. In a speed-dating study, people tended to be desired in return when their interest was specific to one person, while those who were keen on nearly everyone in the room were desired less. Interest lands when it feels chosen: not that they like people, but that they like you.
Closeness grows in a similar way. Gradual, mutual openness — each person revealing a little more, and meeting the other’s openness with warmth — is one of the most reliable routes from acquaintance to intimacy. It is the idea behind the 36 questions to fall in love, the well-known study in which pairs of strangers took turns asking each other increasingly personal questions.
Uncertainty: why not knowing can pull you in
Being liked is attractive. Not knowing whether you are liked can, for a while, be more so. In one experiment, students looked at the profiles of people who had supposedly already seen theirs. Those told it was unclear how much the other person liked them thought about that person more often, and ended up more attracted than those told they were liked a great deal.
Uncertainty keeps a person on your mind — in daydreams, in conversations you replay on the bus, sometimes in your actual dreams — and a mind that keeps returning to someone starts to read the habit as a feeling. It is part of why the enemies-to-lovers story grips so many readers: friction and not-knowing make every small kindness land twice as hard. The catch is that the pull of uncertainty is a pull, not a verdict. It tells you someone has your attention. It does not tell you they are good for you.
Other people’s choices: why the taken can seem magnetic
Attraction is social, too. People can find someone more appealing once they see that someone else has already chosen them, a tendency researchers call mate-choice copying. It is one reason a person in a happy relationship can seem to glow, and one reason all the good ones seem to be taken. Nothing about it makes you strange or disloyal. Your social brain is using other people’s judgement as a clue, the way it does with restaurants and films.
Being drawn to someone who is with someone else is not a betrayal of anybody. Acting on it in secret would be, because that is cheating, and it usually takes lying to keep it going. Noticing the feeling, naming it, even telling someone about it: those are yours to handle as you see fit.
Looks: they matter most before you know someone
Physical attractiveness matters, particularly at the start. When strangers meet briefly, how attractive they find each other is consistently among the strongest predictors of who wants to meet again, and the jolt people call love at first sight turns out to be mostly about appearance.
But looks count for less the longer people know each other. Couples who had known each other for a while before they got together tend to be less closely matched in attractiveness than couples who started dating soon after meeting. As people get to know each other, their judgements of who is desirable drift apart: one person’s ordinary is another person’s favourite face, and humour, kindness and the particular way someone treats you start to outweigh a first glance. It is the best argument there is against the idea that anyone is out of your league.
Chemistry: the part nobody can predict
Put everything above together and you can predict a fair amount about who will be widely liked. What nobody has managed to predict is who will like whom. Even with detailed measures of personality and preference collected before people met, researchers have not been able to tell which particular pairs would hit it off. That unforecastable part is what most people mean by chemistry.
Chemistry is worth something, but it is not the whole story, and it helps to know how chemistry differs from compatibility, because the two do different jobs. Physical chemistry is one strand of it, and how much sexual compatibility matters — and how much of it is built rather than found — has a guide of its own.
What attraction does to your body and mind
However it starts, attraction announces itself physically: a quickened pulse, a warm face, a sentence that comes out in the wrong order. The nerves are not a sign that something is wrong, only that something matters, and being nervous around your crush is about as common as human experiences get. Attraction occupies the mind as well — the replayed remark, the glance at your phone — which is why it can feel like something happening to you rather than something you chose.
That is worth holding on to whenever a feeling arrives at an awkward moment. You did not decide to be drawn to your colleague, your friend’s flatmate or the person who is already spoken for. Proximity, familiarity and a dozen small kindnesses decided it for you. The only real decision is what you do next.
Where IF fits: attraction grows where you live
Read the list back and one thing stands out: almost every force behind attraction is local and slow. Nearness, repetition, a shared joke, the sense of being chosen — they build over weeks at work, at university, among friends, and they pay no attention to timing. So the person you fall for might be single and already on IF. They might be someone you know only in real life. Or they might be in a relationship, as you might be.
IF was built for all three. When you are both single and they have a profile, the move is a Like, and a chat opens if they accept it. When either of you is spoken for, or they have not joined, the move is an IF, which arrives sealed and holds up to 250 characters. You can reach them through Swipe, or find them in Search with the Instagram handle, number or email address they shared with you. IF may let them know something is waiting for them; the sender and the words stay hidden unless it is revealed. An IF addressed to an email triggers one short invitation, while one addressed to a phone number or handle sends nothing whatsoever: it sits quietly in case they ever join.
You could tell them in person instead, and sometimes that is right. But saying it out loud to someone who is with someone else, or while you are, puts the weight on everyone at once and cannot be unsaid. An IF says it just as honestly and asks nothing of anyone today, because nothing opens on IF — no chat, no match, no conversation — while either of you is in a relationship. Once you are both single, it can be revealed, and then they decide. Your first IF is free. Attraction has already done the slow work in real life; IF gives the feeling somewhere honest to wait while the timing catches up.
Questions people ask
What are the main types of attraction?
People commonly distinguish several. Physical or aesthetic attraction is finding someone good to look at; romantic attraction is wanting a relationship with them; sexual attraction is desire; emotional attraction is wanting closeness and to be understood; intellectual attraction is being drawn to how someone thinks. They often arrive together, but not always: you can admire someone’s face without wanting to date them, or fall for someone’s mind long before anything else.
Is attraction a choice?
Not the first flicker of it. Exposure, similarity and circumstance shape attraction long before you notice it, which is one reason a crush is nothing to feel guilty about. What you do choose is what happens next: whether to say something, when, and how honestly. If the timing is wrong, one choice is an IF, written now and opened later.
Why do I feel drawn to someone I barely know?
Because first impressions form fast and run mostly on appearance, voice and manner, and because a little mystery leaves room for your imagination to fill in the rest. That early pull is real, but it is a prompt to find out more rather than proof of anything. Getting to know them is the only way to learn whether it grows.
Can you become attracted to someone over time?
Yes, and it happens all the time. Familiarity tends to warm people to each other, and as you learn who someone is, what you find attractive about them shifts towards humour, kindness and how they make you feel. Plenty of couples were friends, colleagues or classmates for months or years before either of them felt anything more.
You do not get to choose who you fall for, but you do get to be honest about it. Whoever it is, and however awkward the moment, say it in an IF and let the timing come to you.