Like Bella in Twilight, the protagonist in Fifty Shades feels frumpy, dumpy, and entirely unworthy. Ana Steele in Fifty Shades is one of the "little people below." Christian Grey, the twerp of this sorry business, is way too beautiful for her, and his beauty justifies however he may want to hurt her. She is unworthy of the perfect one -- that man over there with straight teeth and crooked desires. If a man hurts you, then what did you expect? Isn't he worth it? And did you deserve any different? Haven't you finished the Twilight series yet?
"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).
Yeah, well, there's that. "Other than that, how was the play, Mrs. Lincoln?"
It is all there, just like Twilight -- the moodiness that keeps the woman off balance, the aggression that makes her blame herself, the straight teeth, the deadliness, the desire to hurt. Christian Grey doesn't sparkle though. Not even in the dialogue.