Hundred Dollar Tattoo

A man walks into a tattoo parlor and says he would like a $100 dollar bill on his dick.
Well the tattoo artist laughs and says:

- I'll do it for free if you can give me one good reason for it.

The guy thinks for a second and says:

- Well one, I like to keep my money in my pants, two I like to watch my money grow, and three I want to see how fast my wife can blow a $100.