H2H Heart 2 Heart collection Nipple Clamps Criss Cross with Black Chain. Nipple clamps can be applied to the nipples of either men or women. They create pain/pleasure by restricting blood flow from erect nipples by applying pressure to them. Most nipple clamps are adjustable allowing the user to determine the amount of pressure. Tension screws located on the top of the clamps lets you add a little or a lot. Nipple clamps can be applied to the nipples of either men or women. They create pain/pleasure by restricting blood flow from erect nipples by applying pressure to them. Most nipple clamps are adjustable allowing the user to determine the amount of pressure.