Apparently there are people in China who use logs suspended by chains to beat the hell out of their own nuts. Caution: These are experts at destroying their own nuts. Do not try this at home. If you suspend a log with chains and use it to hammer yourself in the balls, you really have to know what you are doing.
China’s Iron Crotch masters fight to preserve their painful tradition - YouTube
China’s Iron Crotch masters fight to preserve their painful tradition - YouTube
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