False equivalency. We're talking about intellectual content, not ingested substances.
You still haven't answered about the other titles I listed: The Kite Runner, Oedipus Rex, Romeo & Juliet, Othello, The Absolutely True Diary of a Part-Time Indian, Judy Blum. I'll add a few more: 1984, Catcher in the Rye, Diary of Anne Frank, All Quiet on the Western Front, Hamlet, MacBeth, Twelfth Night, Night, Julie of the Wolves... All of those books have troubling content, many of which relate to sex.
You still haven't suggested any steps to any process for determining a book's appropriateness. As far as I can tell, an angry mob of keyboard warriors or an 11-year-old activist being videotaped reading to the school board should result in kneejerk decisions without knowing anything else about the book.