If I get hit, I hit back. Sorry, but that's how vindictive I am.
Unless of course I'm hit by a girl an it was a real accident. If it's a guy, he's dead on the next forehand over overhead I get.
So far, never been hit in the head or groin. Been hit close in the thigh and once in the upper arm as I moved my head away. Both times it left a bruise but that's about it. I did return the favor though.
How else will they learn to control their ball?