this might not work for you but as i've never been slapped (except by female friends after i told them that i've never been slapped) the best line i've used is "you have a beautiful face it'd look great with my dick in it" either the lady runs or laughs. if she laughs i know it's my kind of lady and go from there getting past my first impression. btw this lines run about 50/50 which is pretty good odds.

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i'm funnier looking