> hiding the fact that selection is in fact seriously limited

If your goal is "prevent children from accessing adult material", it really isn't that limited.

> underaged kids can not checkout non kid material without adult in the loop

They don't need to. They can read it in the library; that's what libraries are for.

Have you ever been in the library? Cause they really limit minors.

And obviously "adult material" is not referencing cookbooks for housewifes nor antic philosophy nor fantasy books meant for adults.

It does in fact means porn and such.

I have been to my library yes. You don't need ID or a library card (unless you want to check something out or use a computer) and you can pick up any book you like (including e.g. 50 Shades of Grey), sit down at a table, and read it. There are children in there all the time and there isn't an adults-only section.

A minor can walk into any library I've been to, grab any book off the shelf, and read it.