There is some really cool anime porn though.

I know with knife play some people get off on the percieved fear. Others on the sensation of the cold steel touching them. There's also some skillful cutting as well I believe? It's not an area I know much about tbh.

Being suspended by flesh hooks can look quite cool, it actually hurts more pushing things through the skin from the inside than from the outside. Not that I've used flesh hooks. I've played with needles and pins a bit though