4. Nipple clamps are just for nipples, right?
You could put it like that but I have a different kind of interpretation. So to help you understand I'll descript a few possibilities. The chain has two clamps so I could let you clip one on your nipple and attach the other one to a fixed point. Now if you move you will feel the tension rise and you know exactly where your place is and not 5mm further. The second idea is to clip them on both of your index fingers with the chain between your legs, so one hand is in front of you and the other one behind your back. Pretty uncomfortable position to be in while getting yourself off with only using the chain to touch your clit and you fail if the clip goos of your finger.