A good idea in theory, and one that's been mentioned to me before. Unfortunately, there are two problems with it:
1. It would seem that paying someone for sex would obviate the whole abuse thing... if I'm paying someone, then it's more than possible that they'll pretend to minimize or ignore the trauma I might cause for them in favor of the money, depending on how mcuh they need cash (or repeat business). At least, I know that would go through my head. "Exploitation" (whether you believe that's what it is or not) wouldn't get to the real issue for me.
2. I'm a starving student with no money
Good thought, though. I appreciate it.