What is "nipple clamp"

n. A pair of metal clamps, usually joined by a chain, meant to be worn on the nipples to cause pain, usually in BDSM.

A nipple clamp is a sex toy. It is a clamp that is applied to the nipples of a woman or man. It causes pain by the pinching of the nipple, by the restriction of blood flow, and by the reintroduction of blood flow. Nipple clamps are used in some BDSM activities, such as breast torture. The main types of nipple clamps are the clover clamp, tweezer clamp, piecing clamp, and clothes-pin style, though any device that applies direct pressure can be used. Clamps are typically used in pairs and connected by a chain. Weights may be hung from the clamps to amplify the pain by increasing the pressure and pinching. The chain may be wrapped behind a fixed piece of erotic furniture such as a post, so that, when the wearer is prodded to jump or otherwise move suddenly, pain is increased by pulling of the nipples. Another variation involves attaching another chain to the chain, the end of which is connected to a clamp attached to either the clitoris for a female or a cock ring for a male. This variation is known as the "Y clamps" for the shape of the chain linking all 3 connection points when attached to the body.