I was with an escort last week and she was constantly playing with my nipples says it's a fetish of hers. Her next comment has left me slightly self conscious. Apparently I have the biggest erect hard nipples she has seen. Now I find myself constantly playing with them ,tweak them clockwise my arse twitches pull them my dick nods up and down. Is this normal to have hard nipples all the time or should I seek medical advise.