In 2011, the erotic romance novel 50 Shades of Grey was released, quickly becoming a global phenomenon, selling millions of copies to an audience eager for sexy thrills and, in many cases, an introduction to the world of BDSM.
I won't lie. The success of that book and its sequels creeps me out. It was developed from sexually explicit Twilight fanfic, when writer E.L. James uploaded it to various fan sites under the pen name "Snowqueen's Icedragon." There's something disturbing about realizing that there's a huge online population who enjoy masturbatory reading material based on books like Twilight and the Harry Potter series, but thanks to the Internet, that's a thing now.