Two responses to "what about the Bible?"
First, none of the passages in the bible that talk about sex are nearly as explicit as the details in "Lawn Boy," "Gender Queer" and "All Boys aren't Blue." Instead it has phrases like "Adam knew Eve, and she conceived," and "the firstborn went in and lay with her father."
That is much different from "I pulled out of him and kissed him while he masturbated," and "pleasure mixed in with the pain." The bible briefly mentions that sex acts occurred, it does not explicitely describe them for the purpose of arousing the reader.
Second, if a librarian decided that topics such as incest, rape, adultery, drunkeness are not approprate at an elementary library or junior high library, and shelved instead a children's version of the Bible, as are used in Sunday Schools, I would have no objection to that. I'm not going to scream that she is a "book burner," or any of the other nonsense directed at people who want their tax money spent on appropriate materials.