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'Fifty Shades of Grey' by E.L. James
"Fifty Shades of Grey" is a book of erotica that started out as "Twilight" fan fiction. It's become a phenomenon, with an insane number of downloads. It also features S&M.
Christian is a steely blue-eyed, very handsome man with a dark past. He's into S&M and in the market for a "Sub" or submissive.
He wants a young woman named Ana to sign a "Dom/Sub" contract with him. Ana, a shy, but funny brunette who has no idea how attractive she is has to decide if she can handle his "Red Room of Pain."
Most of the downloaders have been female, giving the trilogy the nickname "mommy porn." The book is about to become a film. We're casting it for you.