i have never been punched while in a session and i am confident that my Dominant would never punch me. Now, in my younger wilder days, i was in many fights and got punched in the belly and else where. Hated it and i hit back, Hard.
I use punching as part of some play-but in measured doses. You can punch the ass, thighs and upper back with meduim force and not do much damage. But it will release a lot of endorphins. Punching or slapping a pussy has interesting effects as well.
I good sadist can do a lot with his hands. We really don't need toys.