I can't imagine a Public library ever banning these or any other books and would be extremely surprised if they asked for signed permission slips to read any books available in the library. Where does the line get drawn? The kids need a permission slip to read a _Gossip Girl_ novel but what about _Our Bodies, Ourselves_ or any other of a myriad of books that parents might object to? If these parents are worried about what their kids are reading then they need to talk it over with their kids at home and make some family rules pertaining to reading material - don't expect the librarians to take care of this issue, it's a family/parenting issue.