THIS IS FOR BOTH SEXES!
Floss your teeth.
If you want him/her to pay attention to you-- notice the color of his/her eyes. This will keep your pupils focused on his/hers.Eye contact is crucial and a subliminal way to show that you're a sane friendly person.
If you want her to like you right away-- Mirror her. If she scratches her nose, rub your eye. We gravitate toward people like us.
