Agree, and let's also remember that these are wholly voluntary situations. Unchecked power is a pretty big charge in a situation where the student can (Yes, at a cost) always walk away.
I take it you think we should do away with workplace discrimination laws, the minimum wage and OSHA too. I for one, wish there were more thumbs in my canned chili. It's been a little bland lately.
Someone is in a position of power over someone else, and is exploiting that, and a response is to claim that this is a "wholly voluntary situation"?
Really?!