Guys: Does flirting actually work?

Guys, here's something I want to know: Does flirting actually work if the girl isn't a supermodel? Things like smiling, longer eye contact, gentle touching - has this ever worked for you in terms of getting you to make a move if the girl is, say, on the average-to-cute side? How do I get the confidence to flirt like this with guys? Men can be very vicious and humiliate the girl if she dares talk to them, yet all I ever hear is people saying guys are looking for an "opening"... So which is it?
Guys: Does flirting actually work?
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