I chose a few children's books for my Banned Book Challenge: In the Night Kitchen by Maurice Sendak and The Lorax by Dr. Seuss.
In the Night Kitchen has been banned by many schools due to the nudity of the main character who is a young toddler named Mickey. Some librarians have reportedly used black marker to draw shorts on him and others have used white-out to draw diapers.
Searching the internet, you can find out all sorts of symbolism attached to the images and activities. Some are pretty far out. I thought it was an okay book, nothing great. If you are looking for male nudity in a kids book, my suggestion for a delightful story is Tub Toys by Terry Shannon and Timothy Warner, illustrated by Lee Calderon. The grandkids love it and Papa, Grandma and all the aunts love reading it to them.
I was really on a speed-reading roll today, so I went ahead and read The Lorax, too. I was really pushing myself, I know! The Lorax was banned in the Laytonville, California School District on grounds that this book "criminalizes the forestry industry." This cautionary tale chronicles the plight of the environment against the greedy Once-ler who cuts down all the Truffula trees to knit Thneeds from their soft tufts. Originally published in 1971 it's the only Dr. Seuss banned from school curricula across the US. Of course, as the country became more environmentally-friendly The Lorax has been incorporated into many lesson plans.