"Pornographic" is a big stretch there. It doesn't appear to intend to be arousing, so I have a hard time calling it pornography. The subject matter combined with the art style is a little jarring, but less pornographic than half of Instagram or Tiktok.
> Why do you want this to be shown to children?
Because our sex ed is terrible to the point of being useless, and this seems better than "sex ed brought to you by PornHub". From the bits of the book I saw (Let's Talk About It, if I'm not mistaken), it actually talks about how to have positive sexual experiences and includes non-cis and non-straight folks. You know, all the stuff that people normally have to figure out (or not) by trial and error over years.
It's worth bearing in mind that the average age of virginity loss in the US is 17, so ~ half of the students in a high school would have had sex already. The average age for someone to first see pornography is 11-12 in the US. This book is likely not the first place someone would see a penis or vagina, and I would prefer that children had some reference other than literal porn for what healthy sexual activity is.
They are still available at public libraries, book stores, online, and literally anywhere else one obtains books.
Here's a picture of inside one of the "banned" books: https://theiowastandard.com/wp-content/uploads/2021/10/6.jpg
Why do you want this to be shown to children?