Thanks for asking! That makes sense. You can take a look at the technical definition of a TK in our glossary. In this instance it’s called a TK to differentiate it from other variations of the butterfly harness that make different shapes, like the strappado variation seen here.
Shibari Study Support
Berlin, Germany
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07 Aug 22:17
Also the downward pressure onto the cuff from the bottom’s body weight and active engagement of the tie!