Here's something interesting:

I stumbled on this after seeing the trailer for the new Fifty Shades of Grey movie:

Peter Tupper of The History of BDSM has written a chapter by chapter critique of the Fifty Shades of Grey books here.

Full disclaimer: I've never read the books themselves, so I don't really have an opinion about them*.  I do not know if the reviewer is being fair in his treatment of the books or not.  I just find the point of view interesting.

(*The movie looks awful though.  Just saying.)