drop bear
Sr. Grandmaster
The "groin" argument has been brought up earlier in the thread, and in fact, it seems to come up anytime the topic of grappling and self-defense is under discussion. First of all, as many have noted, a groin strike is not some sort of skeleton key. Secondly, against an experienced grappler who knows how to control your arms and manage distance, they aren't as easy to pull off as one might think. Neither are bites.
One of our guys got head butted in the groin during a take down drill last night.
He wasn't allowed to stop. But he did groan a bit.