That's "Gender Queer," a book that received very high praise from the American Librarian Association and the American Association of School Librarians. It was recommended for "Young Adult," i.e. 12 - 18 years old according to those organizations.
There is a novel called "Lawn Boy" that depicts in narrative, a boy remembering fondly having performed felatio on another boy, and now fantasizing about the same with an adult man. Again highly recommended.
Librarian or School Librarian is a fine and needed profession, but like so many professions, its professional organizations are entirely controlled by extremely woke self-appointed social justice warriors.