That^ brings up an interesting point.
"just curious about nipples..."
I've never seen so many enhanced titties since I've joined this site. A lot of the man mades have an effect on nipple sensitivity. I've seen some that were permanently erect, some that were extra sensitive and some that were numb. My favorites are the large eraser sized nipples that are about 1/2" long. But there was one outstanding lady that her nipples reminded me of small mushrooms. It seemed like the more you sucked on them they just kept growing in my mouth... Amazing, I gotta get back in on that!