50 Shades of Gray (Erotic Fiction)

My whole office is reading and talking about this book, "50 Shades of Gray" by  E L James. It's the  New York Times #1 bestselling erotic fiction paperback and e-book. It is notable for its explicitly erotic scenes featuring elements of BDSM.  I now have a copy of this book and I am looking forward to reading it.  Not sure if it is my cup of tea, but....I have to know what all the fuss is about.......just being curious