Humbler

A man wearing a humbler, from behind.

Wikimedia (CC0)

A humbler is a device used to restain a males testicles behind their legs, which restricts their ability to stand, forcing them to stay bent over or on all fours if they do not wish to pull on their testicles causing anything from mild discomfort to extreme pain depending on their anatomy.

A humbler consists of 2 bars, shaped so that they rests comfortably behind the legs, with a groove or gap cut into them so that when closed, the males scrotum is in this groove, thus restraining their testicles behind them. This design is normally made of wood, and can occasionally also incorporate other devices such as rings to connect cuffs, or a ball crusher to further enhance the use of the device.