Fifty Shades of Grey depicts RAPE and has been criticized by BDSM advocates

[Spider Jerusalem]

134. As an aside to the above, and possibly worth noting in discussions around this:

Non-consensual situations are one of the more common sexual fantasies self-reported by women. Which, it's important to note, doesn't mean they want to be raped. "Rape fantasy", as such, from the female perspective, seems to be about the erotic thrill of being the object of uncontrollable desire coupled with loss of agency that implies freedom from the culturally-acquired shame of "nice girls don't".

This is an area where I'll confess to having something of a double standard; I can intellectually understand the appeal of non-consensual fantasy situations, for women, while still finding men who have rape fantasies to be creepy...because a guy who has rape fantasies is getting off on the idea of being a rapist, which is something completely different.

All of that said, I don't see that "50 Shades of Grey" is especially defensible as a depiction of a D/s relationship, because the relationship as depicted (from what I've gleaned anyway, I haven't read it) doesn't fit within any reasonable definition of "safe, sane and consensual".