I think it’s a roundabout way of banning the Bible. If explicit sex is banned, the Bible should be banned for its sexual imagery. So to speak.
Rhe Holy Bible relates cases of rape and sodomy, but as a matter of historical fact. It does NOT give instructions on how to commit such acts, and has no pictures.
I think the librarians are specified because that group has a large marxist majority in their membership and controlling all their organized groups. Scratch a librarian in a school and chances are there is a communist underneath.