for those who don't know, you can see a detailed explaination here:
http://www.tattoocrazy.co.uk/piercin...male.html#apad
be warned, it has a few images that may not be considered work-safe.
that said, yowza. i'm really adverse to pain in the groinal region, so i think this is something i'm gonna have to pass on. be sure to keep that nice and clean, the worst thing in the world would be an infection down there. best of luck!