Go up to a girl who looks like shes goofing around having a good time. Grab her attention with a quick kino to the shoulder or something. When you have her attention point up to the corner of the ceiling or someting as if there was something there. Gradually (but not so slowly you lose her attention) move your finger to point at your crotch then crack a huge smile that says hahahahahahaha you just looked at my crotch. Human nature will usually cause her to follow your finger with her eyes. Then excuse yourself and go back to your friends... tell them how it went, have a drink, bump into her later and start teasing her about it. Field tested x3 worked twice. Just dont be creepy about it.

Thoughts?

this is a great opener- when she looks at your coock, immediately tap under her jaw and tell her to stop staring with her mouth open bcuz her mouth naturally opens when she starts laughing
or tell her "not yet"

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i'm more playful, ergo i win