Hojojutsu
Definition
Hojojutsu is the traditional Japanese martial art of restraining prisoners using knotted ropes. They were also used as a form of torture.
These techniques are still taught in Japan for police work and are commonly seen in traditional ju-jutsu systems.
They have also been adapted in less brutal forms for sexual bondage in the form of kinbaku, (also known as nawa shibari, literally "rope tying"). --http://www.wikipedia.org/wiki/Hojojutsu
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