Zipper (BDSM)
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In BDSM terms a zipper is a string of clothespins or other clips, held together loosely by a cord or light chain.
The skin is clipped in the clips for a short time, then the cord is pulled causing the clips to be pulled off the skin one by one in sequence causing a "zip" sound, and a unique sensation.
Zippers come in many sizes and varied numbers of clips, as many as a hundred can be used in one zipper. It is a very popular home-made BDSM toy.