Okay so me and a friend have been doing this for awhile and it almost always works. We have yet for it to fail. The best way to score is to go into it honestly and confidently but all that aside here it is:

This requires a girl you have been talking to for a while or atleast some one that you can be comfortable enough to tease.

We every so often call the girl prude. Jokingly ofcoarse. For instance, we would call a girl prude for something like not giving a dude her number or even something trivial like "It's your first time shlacking your nails? I'm not even surprised. You're such a prude" or she'll say something like "I have never.." and the response would be of coarse commenting on her prudeness...

The result: This has worked countless times. One day she will say "that's it I am not prude" and jump you or your friend.

It works by making her qualify herself. This is just a side game we run on some girls that has a payoff in the long run.

Thought I'd share the little experiment me and my friend do with the community.