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brushing her hair, or touching her wrist doesn't accomplish anything. It has literally nothing to do with it. Yes, she needs to be comfortable with your touch, but that comes from major and sustained contact. Not little fleeting taps.
It has also been a long time since I have actively read any methodology but from what I remember, most methods recommend starting with small, fleeting touches.
In my experience, I have found that the little high fives, fist bumps, "claw" arms, wrist touches, fake palm readings, etc. definitely DO work in paving the way for more major and sustained touch. These are especially important for girls (or guys) who are not as comfortable with touching strangers - everyone is somewhere on that spectrum - in order to become more comfortable as the interaction progresses. Guys that are not used to doing this need to celebrate their victories, however small.
The Kino Escalation Ladder by Vin DiCarlo - highly recommended. Touching her hair may not "accomplish" anything, but as Vin states, it is an indicator of her comfort/trust with you - people don't let just anyone touch their hair or their head.