rub the knob:

To masturbate , said of males. See masturbation-male for synonyms.
See Also: amatripsis, belly-fuck, big hug, Detane, dual dildo, Eskimo kiss, frictation, full-service, gonk, joyknob, knobster, nobs, rub, syntribadism, syntribate, titty masher, tribadance, tribology, tummy-fuck

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