Not sure how I'd feel about tying someone up, but being tied up myself is a big no. I have issues with complete physical vulnerability. Not being able to block a blow or escape if need be makes me panic.
It's not limited to pain either. When I was younger, my dad and I would fight for fun and he'd eventually lock my arms behind my back and tickle me on end. Almost tore my right arm out of its socket once because he kept it up for just a bit too long.
I know there are safewords and other precautions involved in those activities you describe, but I wouldn't feel safe. While I might be calmed enough to not chew off my own arm to get out, I'd definitely not be aroused by it. Which would defeat the purpose of the game, right?
It's kind of the point that you're not blocking or escaping the blows
Although you don't have to be tied up for that, of course.
But just imagine what it'd be like to have a girl tied to your bed, completely helpless while you can do anything you want to her.