A new martial arts video in China is teaching men how to toughen up their crotches. Shi Yanwu, a self-proclaimed monk, teaches men "Tiedang Gong" or "Iron Crotch Kung Fu". The video includes shots of Yanwu being kicked in the crotch, a monk hanging by a rope tied to his penis, and a monk using his penis to pull a heavy stone.

The video says that practicing Tiedang Gong can make "a man can not only protect himself better, but also improve his sexual agility and potency." Yanwu claims he learned the technique at the Shaolin Temple, but is now the only monk left who understands the art.