Libraries decide which books to carry, and which books to pass on. School libraries do the same. That doesn’t mean that the book is banned. If a person wants a book that the library doesn’t carry, all they have to do is go buy it. I am a voracious reader, and even I don’t think that we need public libraries any longer. The Internet has effectively replaced them. School libraries need only carry books that directly reflect what is being taught, and a small fiction section that contains books appropriate for the age group that will be checking them out. That means no sexual content. None.
You are free to read and write whatever books you wish- but the taxpayer isn’t obligated to pay for them or to provide them.
If you, as a parent, want your child to read a book of instructions on how to suck dicks, all you have to do is buy it and give it to your child. Just because a book isn’t carried in the school library doesn’t mean that the book is banned. The left has done this with Bibles for my entire life- try to find a copy of a Bible in a school library. That doesn’t mean that the Bible is banned.
As far as I know, there is only one book that is banned in the United States– Cody Wilson’s “The Liberator Code Book: An Exercise in Freedom of Speech.” That book is banned for sale. Not available anywhere.
So why is a book on how to build your own guns banned, but books telling children how to suck dicks aren’t? I will leave that discussion to my readers.