I guess that would be "Lolita" by Nabokov. I can just imagine the collective gasp, right now. Who dares criticise the grand, the amazing, the flabbergasting Nabokov?!
Truth be said, Nabokov charms readers with the fact that he unapologetically explores the dark side of the human soul. He is rock'n'roll, born to be censured and oppressed. Truth being said, when I read "Lolita", it gave me a lot of courage. Gee whizz, I can write too if this is what society desires. It is considered that Nabokov has absolutely impressive style. And yet, what I see is an overuse of figures of speech, a twisting of stereotypes and cliches. I will give you an example. The celebrated: "Lolita, light of my life, fire of my loins. My sin, my soul." How many of us have written such platitudes? Mind you, we don't have a herd of rabid admirers demanding the Nobel Prize of Literature for us.
If I want a safe trip to the dark side and to be seduced by perversion, I will go for "Paradise Lost". No offense to Nabokov or anything, but they did it better in the 17th Century.