Eye contact is a big one. When I like a guy I always find myself staring into his eyes. Especially when laughing at his jokes and stuff. I also tend to become either really shy around him, or really 'touchy-feely'. Oh and teasing/making fun of him is something I probably do too, lol.
Men often comment that they would love it if girls approached them first, but I have found that the very opposite is true. More often than not, a guy is turned off by what he sees as desperation....
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