Crotch rope
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In Japanese bondage a crotch rope (Sukaranbo or Mata nawa (股縄?)) is a rope harness tied around the hips and passing between the labia to apply pressure to the female genitals. Sometimes a knot is tied at the position of the clitoris to intensify the pressure. The aim is to generate thoughts of sexual submission and excitement in the person thus tied. A crotch rope may be tied over the clothing or on to a naked person. Crotch ropes are also common in Western-style bondage. They appear regularly in the work of Robert Bishop.