Guys, are you automatically nicer to pretty girls?

Not like you treat the ugly girl horrible (well unless you really do that), but do you treat pretty girls a little more special than ugly girls? BE HONEST
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Guys who answered yes:

Are you automatically nicer to pretty girls even if you have a girlfriend?

Are you automatically nicer to pretty girls even when they are not interested in getting to know you?
Guys, are you automatically nicer to pretty girls?
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