I haven't read the books, but this is based on a novel by Charlotte Roche. I did watch the first movie they did of her first book (Feuchtgebiete), this is her second book. The first one was extremely crass/gross/sick, you take your pick. But after the release of Nymphomaniac you wonder if there is a pattern there and maybe there is.
This one btw. is not as extreme as the first one. It still has some scenes that will feel uncomfortable (STDs and such) though it's not as graphic as the other movies were that I mentioned above. It won't be everyones cup of tea, but the drama unfolding is pretty nicely told. Jürgen Vogel plays it as straight as possible, but it's the main character/woman who's carrying the load and she did a pretty solid job with that. If you don't mind the sexuality the movie has, you might enjoy it (though do not expect titillating)