I too used books to survive, and I made a policy to never ban a book in my house- my loose rule is, if you're reading it and able to discuss the book, it's themes, what you think /feel about it, what you disagree with, etc. it's fair game. My teens are voracious readers, and we have excellent conversations about what we're all reading. They also know I'm not going to press about any one particular book, generally, which makes reading anything feel pretty safe.