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It's "grooming", regardless of whether it actually accomplishes grooming. The instinct for mutual grooming is a powerful bond-reinforcement for almost all social mammals (and I only say "almost" because there MIGHT be an exception that I don't know about) and also social birds. Add to that the fact that quality hair is a sign of health and a sexual attractant and viola, your girlfriend will play with your hair :P I know I certainly do!
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There's no justice. There's just us.
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