How rough is to rough?

The other day I was talking to someone about how rough is to rough, when your with your partner, it made me think of an old love of mine and she loved to bite and hard, to be dead honest it was a bit of a turn on, but I have my limit which is nothing that causes true pain to either of us, does anyone have a different idea on it?

Being rough is actually pretty fun. I've done some pretty rough stuff, but my limit is when it comes sharp things. She can use all the blunt objects and odd toys she wants, but once a knife comes out, it stops.

"i actually like the blood, nothing else tastes like it" lmao what