Do some research on clinical-level nymphomania.
I briefly dated a girl in college who was medicated for it. When she was off her meds, it was awful. People laugh at me for telling the story, but if you weren’t there and haven’t experienced it, you really just don’t know.
It starts off innocent enough, but the need grows to be insatiable. She became a completely different person and it is literally impossible to please her. There’s nothing you can do, and it will go on for hours. It becomes painful. Rape against a man is possible.
They say, “you can’t rape the willing.” At some point, the will disappears and becomes complete and total fear for your health.
I once had two very attractive women approach a group of us at a fraternity party in college and ask if anyone would volunteer to take them somewhere and tie them up.
To my own astonishment, none of us moved, volunteered or said a word. Somebody should study that phycological phenomenon. I've always wondered if they found someone to help them out and what could have been. "Dear Penthouse, I never thought it would happen to me...."
(Obviously I've never been in that situation.)
(Although I have been in situations in which even my almost inexhaustable prowess became exhausted and friendly passivity had to suffice.)
Cry me a river.