most of what limited martial arts training I've seen, plus hearing anecdotes about street fighting in general, indicate that most aggressive people shield their nether regions when attacking. It's a high value target, but can be hard to get to. The shin and feet are good ones, since you want to do your stuff, and not be persued.

I wish I'd said that.. The Staircase Wit

anahl nathrak uth vas betude doth yel dyenvey..;)