How do you know a guy is checking you out?

Anonymous
This may seem like a stupid question, but what are some things you guys do when you are checking out a girl. My friend told me the other day that guys always check me out when we hang out but I have never seen this. I do not think I am ugly or anything but I do not think that this is really happening either. I am not a model, just normal. So just what are some of the things a guy would do so I know if I am just oblivious or she is reading too much into when a guy passes by us.
How do you know a guy is checking you out?
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