Pastor Doug Wilson has written a very sound critique of the reprehensible bestselling book, "50 Shades of Grey". I would highly encourage you to read it here.
The gist of the review is that abuse of women is never okay whether they "volunteered" for it or not. If you were to ask the average woman on the street, "when is it okay to hit a woman?" I'm sure that the overwhelming answer would be, "NEVER!" Then, if I may ask, why are so many women falling head-over-heels for this book?
For a short synopsis of the main dynamic between the characters check out this portion of the book.
"I don't want to lose him. In spite of all his demands, his need to control, his scary vices, I have never felt as alive as I do now. It's a thrill to be sitting here beside him. He's so unpredictable, sexy, smart, and funny. But his moods... oh -- and he wants to hurt me" (Fifty Shades, p. 259).
In response to this section Doug Wilson responds, "Yeah, well, there's that. 'Other than that, how was the play, Mrs. Lincoln?'"
As an evangelical reformed Christian with a robust view of biblical manhood and womanhood this kind of putrid nonsense attacks the very core of what I believe the relationship between a man and a woman ought to be. A man should never do anything to harm a woman: not in the kitchen, not in the living room, and not in the bedroom. A man's (a husband's) role is to serve and to love as Jesus served and loved the church even giving his own life for her. Jesus does not dominate the church, he does not abuse the church, and he does not make unreasonable demands from the church; neither should any man do those things to his wife.
Women, do yourselves a favor; if you're tempted to reach for a book like this, don't. Reach for a Gospel. See in Christ how a woman should be treated. Don't read something that encourages creeps to turn you into an object for sadistic pleasure. Read the word of life that encourages men to love you with divine love.
Men, do yourself and your wife/daughters a favor; don't let that trash into your house. Don't let that sort of thing infiltrate their minds. Exercise your God-given responsibility to guard your home and by your own example show the very foolishness and backwardness of a book like 50 Shades of Prey.