Guys' peripheral vision

Anonymous
Hey guys. I'm wondering how you 'check out' girls you find interesting without giving her clues. There's this lad in my class who's always sitting at the front and I'm somewhere in the next road - and very often tends to turns his head sideways where I'm at and I have no idea what he's looking at. I can see this because I have a woman's broad peripheral vision and I always thought that men need to actually have their eyes fixed on someone to focus on them.

Also, if a guy constantly messes with his hair in class couldn't that be because he's vain?

How would you hold your body if the girl you liked always sat behind you at uni/work ect.? Especially if you didn't want her to know (for some weird reason) I really don't understand how someone can show many signs of interest/attraction and not do anything about it - almost avoiding it! Some say it's because their intimidated or they think the other person aren't interested.
Guys' peripheral vision
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