If you are a good player you have enough control to hit at someone without hurting them. If I had 1$ for every volley hit between my legs by a poacher I'd have a lot of money.
As Lendl famously said after hitting Mac, "Hey I didn't invite him to the net."
Mixed is another ball of wax. I always go easy on the woman. I have friends who will crush the female, anything for a win.
The dangerous players are the lower skilled but powerful guys. They will hit you in the head. Got hit in the forehead by an overhead smash that any skilled player could have easily angled off. Ultimately it was my partner's fault for giving the guy a duck but I wasn't too thrilled with johnny testosterone.