Yes i have read it. Im not talking about the book. The book doesnt highlight the dark side of this at all. It just promotes co-dependency and allowing a man to treat you like crap. Staying with someone who is "fifty shades of f**ked up" in the hope that he will miracioulously change. The whole book is based on infatuation. It doesnt tell you what happens AFTER you marry this man and AFTER you are completely dependant on him in every way.
The book isnt about BDSM at all. Its about women thinking a man like him exists who would actually make you happy which is bull