Dangerous!!!??? Are you kidding me???!!! This is exactly what America's lovefest with p 0 r n has gotten us...women actually contemplating their boyfriend's fist up their hole. Yes, very dangerous to continually thrust a clenched fist back and forth into a relatively small opening in the women's body. Especially one not designed for such activity. And I'll save you the time and trouble for the next question: Is fisting my anus dangerous? Yes. Both need to be left alone by one's fist. Geez...