In college, I used to use hair clips, the little kind with teeth (usually 4 on each side). Different kinds had different bite so it was always different. I really love to read stories so I'd make a little "game". I'd put a hair clip on each nipple and pick a story and have to leave the clips on there until I'd read each and every word. If I found myself skipping or skimming, I'd have to go back and start over.

If I was unlucky (or lucky depending on your view) the story would be long. I'd alternate one story on, one story off. drove me crazy!

It was always a thrill to wear them in my hair later. Then someone told me that with my hair pulled back in them I looked like an innocent little girl.... if only they knew.