knee spreader:

In BDSM and sadomasochism, a spreader-bar designed to be tied at the knees of a bottom forcing the legs open thus increasing the feeling of vulnerability.
See Also: bar, biscuits and cheese, genupectoral, genuphobia, gonorrheal arthritis, gonyphilia, gonyphilous, knee spreader, leg spreader, leg stretcher, prayer bones, spreader bar

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