Also, reading this of course Lolita comes to mind. To this day, one of the best books I have read (although Pale Fire is the more literarily impressive one of Nabokov). Lolita is an example of a book that explores a complex controversial topic, with an unreliable narrator which forces the reader to think about what is actually happening and what is not.
Banning books and not allowing content such as this, where clearly no child is actually harmed, is insane.
Edit: the novel in the article takes the point of view of the (potential) minor rather than the adult. Doesn’t really change my point, in my opinion.