You go out to a resturant with your girlfriend. The AC is roaring and it's really cold. Do you instinctively look to see if her nipples are erect? NSFW

Mine tries messing with her shirt so it's not so noticable. Imagine if we got a big buldge in our pants anytime we were cold, when the exact opposite actually happens

If you are into peircing you could get nipple barbells. A guy would explode in his pants watching the nipples rise with those little metal things attached to them