There is quite a gap between the terms in which the contract is discussed and the practices that are then shown on-screen. The writers were like "oh boy this scene is only words so we can go WILD" but then for the scenes of actual sex, they realized they already had exhausted most of their allowed transgressiveness because the actress was naked anyway, and so they couldn't push it further than blindfolds and whatnots.
Christian Grey is cold, impersonal, unfunny, creepy, manipulative, and no matter how pretty his face is, he constantly looks like an overall douchebag. So I can definitely believe the part where he finds women (most likely hires them) and make them sign a contract to do weird shit with him in his basement; but I definitely DON'T believe the part where a young normal woman finds he has any appeal.
Absolutely crappy shit anyway.