I've just read Nipple Tweaking Parties and thought I would share a comment that these ladies might want to consider. Like the author of the story I too have quite large and long nipples. I cried when I was going through puberty and I wanted them to be much much smaller. Later I discovered that they became a huge asset.
Anyway, several years ago I was doing a little experimenting and I tweaked my nipple quite hard with my finger. It felt tingly and not at all unpleasant. The sensation lasted for just a little while. I then elaborated on finger tweaking and I tried the handle of a wooden cooking spoon. I stuck my chest out and struck the nipple quite hard with the wooden handle. My nipple tingled like crazy and for a longer period of time. I also felt myself becoming aroused sexually.
I then did it to the other one with the same results. When the tingliness went away I again hit the one nipple even harder and then I quickly hit the other one just as hard. The sensation in my nipples intensified noticeably. I was also becoming even more aroused.
After doing this to each nipple about five times I went to my room and masturbated. I achieved a very satisfying orgasm. My nipples suffered no ill effects and I've been doing this fairly regularly since then.
Once in a while I ask my friend Liz to do it to me. It feels even better when someone else does it to you. She is very accurate and always manages to hit just the nipple. I then do it to her. We admitted to each other that we masturbate afterwards. Give it a try ladies you just might enjoy it. I think it probably helps to have somewhat long nipples.