My boyfriend plays to ruff.?

I and my boyfriend like to play around but sometimes I think he forgets I'm a girl, like the other day I punched him in his stomach and he turned around and pucnched me in my , which any girl knows is really painful. He then puched me on my arm 15 times. I do occasionaly beat him with the belt when hes sleeping naked however we both find this amusing. Should he be so ruff with me?