Here is a question for you:
If a desperately poor man signed a contract to work in a factory with a piece of machinery that was known to be dangerous, and that piece of machinery ripped his arm off, would you argue that it was his own fault because he ‘chose’ to be there? Because he was being paid to be there? Would you argue that he signed a contract, that he knew what he was getting himself into? That nobody was holding a gun to his head and forcing him to work with that machinery?
Then why do you think women being sexually abused on a porn set is fine because they signed a contract, because they get paid, because nobody is holding a gun to their head?