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Historically, testicle cuffs may have been used by the slave traders of Western Africa, as a means to subdue newly-captured males. In processions to markets, the males were bound to each other in single-file formation, usually by the hands, with ankle manacles in place. The testicle cuffs extended between the legs, and each man was connected to the next by a rope between their genitals. These tight metal bindings on their scrotums were to ensure that a quick pace was kept, for if a man were to stop walking the rope would pull and cause quick, sharp pain in the genital region. doesn't sound vaguely historical, source it or I'll remove it.