My boyfriend and I have noticed that after almost every roll, no matter what I did during the trip, my nipples are way darker than normal. I figured that it was from lots of stimulation during sex. Even after we rave and haven't gotten sexual, I seem to have a noticeably darker shade of nipples. I just think it's kind of funny. If anything, I'd expect them to have a more washed out color after a long night. Does this happen to anyone else? Girls and guys alike. Anyone know why this would happen?