I don't pick at people, but I guess I'm a bit touchy-feely/quite physically affectionate with those I'm close to or feel extremely comfortable around. If I'm close with someone, sometimes while we're talking or hanging out, we'll lean on one another or lay our heads in each other's laps and I'll play with their hair or playfully tweak their nose or (lightly) poke them in the ribs or belly and they usually return fire. But it's situation appropriate and certainly not constant thing--because that would be just plain irritating.