What’s a book you absolutely loved, but would never recommend to your friends to read?

Like the title, a book you absolutely loved, but stop when asked for book recommendations thinking “oh I don’t know about that!”.

I have two currently:

• Saint – Sierra Simone : Sexy Monk love story.
• Hey, Zoey – Sarah Crossan : Woman becomes obsessed with her husband’s sex doll.

These are the two I can think of that I loved, and challenged me, but if friends asked I’d never say.