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Fifty Shades of Grey trilogy by E L James (Fifty Shades of Grey, Fifty Shades Darker, Fifty Shades Freed): Excellent books. I can understand the controversy as they are very descriptive however the plot of an emotionally shut off sadist trying to sort through his demons, & overcome to have a real emotion filled relationship makes this series an absolute page turner.
Explicit, yes. However, the character development prevented me from putting these down. You will certainly find yourself skimming over the 'explicit' just to get on with the story to try and understand this couple. It's been a fun read, better if you have a friend to talk to about it because it's hard to explain why it is addictive until you pick it up for yourself.