A humbler is a BDSM "cock and ball torture" and physical restraint device used to restrict the movement of a submissive male participant in a BDSM scene. The humbler consists of a testicle cuff device that clamps around the base of the scrotum, mounted in the centre of a bar that passes behind the thighs at the base of the buttocks. This forces the wearer to keep his legs folded forward, as any attempt to straighten the legs even slightly pulls directly on the scrotum, causing considerable discomfort (extreme pain).