How do you know if a girl finds you attractive or unattractive?

qstoffe
If you only consider cases where you've never had a longer conversation with the girl. Are there any good indicators, i.e. body language or behavior , that she finds you attractive or unattractive?

Let's say a guy has been throwing you glances on several occations and you're pretty sure he's interested in you. Would you go out of you way to avoid him completely if you found him unattractive in some way? How would you behave if you instead found him attractive?
How do you know if a girl finds you attractive or unattractive?
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