When I was 12 my father took me upstairs to the adult section and filled out a form that said I could check out anything I liked on his card (my card was only good in the children’s library.) the librarian was a bit taken aback “anything? Are you sure?” He was sure. This was a man who put the complete works of William Shakespeare, Rudyard Kipling, Edgar Allan Poe, and Sherlock Holmes on a top shelf in the family room so I would have to climb the built-ins to get them. Guaranteeing that I did. (Bypassing the encyclopedia and other lovely things my mother had put out at my height.)
I got most of my sex ed and an interesting view of religion from Heinlein.