Welcome to the TMF cutiebutt and congratulations on your first post!  I know this place can sometimes be a little overwhelming, so if you have any concerns or issues, my PM box is always open! 
😀
As for your question, I believe that "consensual" carries little value if the S&M activities aren't also Safe and Sane.  Sticking a knife in a girl's face might have been consensual, but it is neither safe nor sane.  If she sneezed or flinched, she could wind up being the next Joker or a plastic surgeon's wet dream.  
There now, how's that for clarification?  
🙂