Intro

Based on a lot of comments from my posts, I'm getting the heavy impression that there is a good portion of guys here that may not be able to tell if a girl is into them, or not unless it's insanely obvious. It's not a big deal if you can't tell. I couldn't tell either especially when I was younger and starting college. My best friend had to practically point out girls that were giving me looks because I was so blind to it (at the time). I've gotten much better with lots of experience, and over the course of 2 years I've really devoted more attention to this stuff and actively studied it more so I now feel more comfortable expressing it in better terms.

This will be a mix of textbook and genuine experience and I'll move from the obvious to the more subtle.

Body

The fact you're even reading this is already a good start, it means that you're now or have been more focused on reading signs if a chick is into you which is just a subset of reading body language in general. Keep in mind that this information isn't perfect and context is key, and you'll never know the full context.

EYES - (Obvious) - When a girl has been into me, they will literally stare. She gets what's called flashbulb eyes, (I used to call it retard stare before I knew the proper terminology), and will have wide open eyes and their eyebrows would raise. This was probably one of the only signals I could even read when I first started creeping on chicks in college.

EYES (subtle) - This may or may not be subtle depending on how obvious the girl makes it, but a girl may already be looking at you and when you make eye contact she quickly looks away and DOWN which is a sign of submission and is inherently attractive to men. Most girls do this multiple times before a guy notices. I've had girls do this to me and it's somewhat obvious, if you keep your eyes open for it. I'm sure I've missed it multiple times though.

The key to this is to maintain eye contact and let her break it first. You can look slightly above her and make eye contact again then just go make a move.

Neck/Hair (Obvious) - If a chick is twiddling around with her hair a ton while looking at you then she's probably into you, especially if you guys are already talking. It's pretty cute when they do it, and they know it is (most likely).

Neck/Hair (subtle) - If a girl has her hair brushed back and it exposes her neck it's again, a sign of submission, which men find attractive. It might mean nothing, but you look for other behaviors as well to indicate she's into you and down for your dong.

Chest (Obvious)- If she's trying to really pop those warlocks out for you to see, then she's definitely trying to get your attention. You ever notice that when you talk to a girl, and they're into you they kind of stand all perky and their chest sticks out a little. That's on purpose.

Chest -(subtle) - This is a sign she's not feeling it. If she starts covering her mammary glands, with a coat or her arms or whatever, she's feeling uncomfortable or maybe she's cold. Again, it's context.

Arms/Hands (Obvious/subtle) - If she's touching herself a lot that's usually a sign she's kind of imagining you touching her. Girls have much more sensitive skin than we do. This can be either obvious or very subtle depending on the degree to which she does it.

Girls also may keep their arms close to their bodies to look smaller (sign of submission) and she may expose her wrist (sign of submission). Personally I've never really noticed the wrist thing, but making themselves smaller is something I've noticed and it's usually with a bunch of other little behaviors to make what I call the little girl effect. Men are attracted to neotenous features, so a lot of girls, I've noticed go into this little girl mode with me (If they're into me).

Legs/feet - (Subtle?) - This is subtle if you aren't aware of it. It's obvious if you literally just check and are aware. People point their feet towards where they want to go or what they are interested in. This may be the bar, the bathroom, the dancefloor, or hopefully you. Girls will also cross their legs in a way to make their legs seem longer. I've noticed the feet thing, but the leg cross I really couldn't tell for the life of me.

Clothing - If a girl goes out wearing high heels, a short skirt, and bright red clothing/lip stick. She's probably at that point in her menstrual cycle that makes her want to get railed out by a guy with good genes, or she really wants some attention to feel good about herself, or possibly both, or possibly it's a culture thing and she always dresses like that to go out and her red dress was the only clean outfit she had. Again! It's context.

Proximity (Subtle?) - There's plenty of places to stand or sit, especially in a bar. If a girl is brushing up against you or is just abnormally close by especially if there is plenty of space for her to be somewhere else with equal access to the bar or whatever, than why is she so near you? You know the answer. Again keep an eye open for context. If her friends were already there and she goes to them and it happens to be near you, then it might have nothing to do with you.

The Big picture

Individually, most of these things mean nothing. You have to look for combos of these behaviors. If you pay attention, you'll get better at noticing them. You just have to practice. It's a skill that's well worth it, and it has carryover to a lot of other things in life.

Some larger clusters of behaviors I've personally seen are the feet pointing towards me, and subtle looks with the eyes. Another big one is the little girl facade combined with being very near me, when there are other places to be, and there is usually a little bit of eye contact as well. Sometimes, a girl will just "accidentally" bump into me and start talking to me or pinch my butt, or touch my hair and quickly turn away like a kindergartener, and once in a blue moon they'll have their friend come over and tell me they think I'm cute. When it happens, it's great, but it's once in a blue moon and I nor you can really rely on it consistently.

Conclusion

You're probably getting checked out by girls already if you're at least above average looking or have some social status. You just don't notice. Keep your eyes open and you may be pleasantly surprised.