Literature should be a transcription of life in all its forms, including the darker parts.
Lolita (Nabokov) and The Monk (Lewis) are masterpieces because they’re horrendous and lovely, appealing and tender at the same time, horror stories and love stories simultaneously. They plow the depths of depravity of desire but they are also true to our nature. Every grown man who has ever ‘looked’ at a younger woman has a bit of Humbert in him.
Good stories should break your heart and repulse you. The Bluest Eyes (Morrison) which explores the effects of societal norms of beauty ideals is a perfect example.
Thoughts beyond our souls—as Shakespeare said.
For Nabokov if you did not read a novel with your “back” — referring to that tingling literature should give you, there was no point in reading it.
You want books that tingle your back? The U.S. Government has kindly complied a list, the Banned Books. Start there. Actually, start with The Bluest Eyes.