In UK most of my vanilla girl friends have/are reading the triology 50 Shades of Grey. It seems that their men folk seem to be kept away from the books and if any vanilla husband asks about reading one he gets brushed aside with comments like "It's a woman's book you won't like it!"
What these stories seem to drive is the young woman's experience in the hands of an older experienced lover who takes her from simple missionary sex into the wonderful world of real hot horny sexual fucking and fu