Pornography: Knowing It When You See It

Here are a set of images captured from books in a "Teens Only!" section of the Daniel Boone Branch of the St. Louis County Library District. I'm not going to display the content here, but my question to you is: should these books be considered pornography targeted at minors? The St. Louis Prosecuting Attorney's Office says they're "educational in nature"... which is the standard defined in the law but still begs the question: couldn't kids learn a lot from pornography? Regardless of the legal classification, I think libraries should stay far away from controversial issues and make themselves places where parents can feel safe leaving their children.