Here's a devious little tactic you can use in social circle settings or anywhere you have a 'captive audience'.
First off: this tactic is not so well suited to cold approach.
But it is really best suited to situations where you are going to see a woman again and again.
You are going to use this tactic to get girls to get on-board with the way you want to seduce them or pick them up. It will both make compliant girls feel extra special, and make non-compliant girls become a lot more compliant (if not now, then in the future).
It's simple to do, but it takes some balls.