rule of 3

n. The fact that a girl can be persuaded to do pretty much anything when asked three times repetitively. This technique can be enhanced by a singular or collective "C'mon" by the asker and/or those surrounding.

Lee: Show me your boobs.
Dumb Girl: No!
Lee: Show me your boobs.
Dumb Girl: No!
Lee: Show me your boobs...c'mon.
Dumb Girl: ...okay.
Nathan: Unbelievable.
Lee (to Nathan): Rule of 3 man.