Shades other than the 50

According to the dear readers of this blog, Fifty Shades of Grey sucks. Here’s my question then: If you could choose the work of erotic literature with which to introduce the unsuspecting masses to the world of BDSM, what would it be? As I said in my other post, I’ve never read Fifty Shades but I’ve also not read much else other than a large number of pornographic ditties.

So let’s have it. What deserves the attention Fifty Shades is getting? What’s a better choice?