Now this sounds a bit scarry... A new martial arts video in China reportedly teaches men how to make their crotch as hard as iron.

Screenshot from 'Iron Crutch Kungfu' video
In the video, a monk named Shi Yanwu demonstrates Tiedang Gong - or 'Iron Crotch Kung Fu' - by having another monk kick him in the privates or having a guy hanging by a rope from his penis, and using his penis to pull a heavy stone roller.
The video claims that by practicing the martial art, "a man can not only protect himself better, but also improve his sexual agility and potency."
Couldn't find the mentioned video, but here's another one, this time it is some demo of iron crotch truck pulling and there's help available if you ever wanted to try that at home.
More crotch madness.
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