You can tell a lot about someone from their behavior, and here are eleven little things people do when they think you’re attractive.
Groom it up

There’s a sign that’s quite telling. They adjust their hair once. Then again. One more time a minute later. That’s when you realize something. They don’t do it with anyone else. Why?
Humans are animals. Just like animals, we groom ourselves, usually as a way to give off a good impression to people we care about. Adjusting your hair once is nothing. But five times in the conversation, and only with you, is more than random.
Something changes in the sound of them

Forget about looking at them. Just listen. Turns out, you might notice their voice gets slightly cleaner and maybe a little softer. It’s a lot more controlled than it was a minute ago. There’s a reason for that.
Research shows people change their voice because of who they’re talking to. They’ll try to sound more put-together because that makes them seem more put-together. Makes sense, really.
The posture shows up late

Posture tells you a lot about someone. One minute, they’re sort of slouching, but then you come over, and their pose is perfect. Their shoulders are back and their spine’s straighter. It’s like they’re back in school again.
That’s because most people see open and upright postures as more attractive. People correct their posture without thinking about it. Take it as a good sign when people straighten up when you walk into the room.
Field of view

That’s not all for positions. People who think you’re beautiful make sure that you can see them, and they’ll stand a little more in the open. They’ll time it so you see them when you walk past. But they’ll do it so subtly that you might not realize they’ve done it.
It’s a kind of low-risk signaling. Essentially, they’re getting noticed without having to commit to anything too direct. The goal is making sure you’re aware they’re there at all. Everything else should fall into place pretty neatly after.
The room gets a slightly louder version of them

They’re already talking as part of a group. Then you arrive. Now, their laugh gets louder, and their reactions come more quickly. They gesture a little more, too. That’s because they’re interested in you.
Yes, people increase their reactions, like smiling and laughing, when they’re around attractive people. It’s not like they’ve ‘changed’ exactly. It’s more like they turned up the brightness a bit because you walked in.
The second look is the real one

That first look when they walk in? That’s called being human because everyone scans a room when they enter it. But the second look is where things start getting interesting. It’s like they didn’t pay proper attention the first time. They have to look again.
You’ll probably see them doing a double-take at you. It’ll be in the corner of your eye. However, don’t think it’s simply curiosity because it’s a lot more than that. It’s their attention snapping back into place.
The smile shows up early

Their positive reaction turns up before you’ve even said a word. You’re just existing in front of them. Then, there it is, a small smile. It’s not exactly a response. No, it’s more like their happiness comes pre-loaded because they saw you.
It doesn’t take a genius to know that smiling’s a common way to flirt. But when it shows up before you’ve said something? That’s a good sign that they think you’re pretty attractive. It’s a great compliment.
They say it sideways instead of directly

Sure, some people might tell you directly that you’re attractive. Most people won’t. Instead, they’ll say it sideways by telling you, ‘You probably get that all the time.’ Maybe they’ll say, ‘I feel like people notice you everywhere.’
They’re not actually talking about other people. They’re trying to tell you that you’re beautiful, just in a not-so-obvious way. It sounds casual. It’s anything but.
Closeness changes their whole attention level

You’ll see them tighten up when you get close to them. Not exactly in a tense way, more like they’re super focused. They’re paying real close attention to everything about you. They’re watching where you’re standing and how close you are.
Any smaller movements that wouldn’t normally matter? Now they do. People who think you’re attractive start locking in because you’re near them. They care a lot about giving off the right impression around you.
The tracking for no practical reason

Try changing your body language slightly and see what they do. You move a little? Now their eyes lift. You change seats? They know. What you’re doing isn’t really that important, but it still registers with them.
Attractive people hold people’s visual focus. It’s something even research has noted. A person who keeps following your movement with their eyes doesn’t really care about what you’re doing. They care that you’re doing it.
It happens in a split second

You’ll have to be quick to catch this one. They start fixing themselves a second after noticing you. It might be a sleeve that needs adjusting, or maybe their collar that gets straightened. They brush their hair back like it matters. Because it does.
People naturally try to ‘fix’ how they look when they’re trying to impress another person. You’re definitely going to want to impress someone you think is hot. It doesn’t matter that these people don’t realize they’re doing it.
Sources: Please see here for a complete listing of all sources that were consulted in the preparation of this article.