I just stumbled across this article of yours as I was scrolling my steemworld.
That's some adult giggle-crap, I would say. No adult could read it without having some Hintergedanke (associated thoughts on sex) to his child.
I've read hundreds of books to my son when he as young and I never came across a book like the ones you showed here.
Western "modern" societies seem as prude as they have been for hundreds of years. Sexuality never can be taught through books anyway. And also not through education but only through witnessing tenderness between adults, childbearing and breastfeeding (as a result of sexuality) and the swinging intimacy between couples/parents that is understood by children by osmosis.
The slightly pornographic undercurrent those above books deliver is just ridiculous and also speak of prudence. If I wouldn't have been contaminated by my society (movies, books, images, advertisement) I wouldn't understand the underlying messages and would innocently read the stories to my kid. As I do I wouldn't touch that books.
There are a lot of gorgeous children books out there. You should make a post about them:)
A book is just a medium, the use we make of it defines whether it's good or bad. I just wouldn't want to see it accidentally find a place in a children's library (mostly because the illustrations would easily have an adult confused).
As I said, I laughed at first, but my mind went to make all kind of scenarios. But I do want to believe they are nothing but a joke and we should just be a little careful when going out to buy books as presents or when someone tries to "equip" a children's library.