That often gets banned for crudeness, but otherwise yes. It has the right idea.

I object to it for a completely different reason: bad spelling and grammar. I think a kid's book should set a perfect example.

Not sure where the other poster lives but the entire Captain Underpants series is in our son's school library. That's where he read the first one and we purchased the rest for him as he's a voracious reader. They aren't the best books but there's a big benefit in the kids having something that they are interested in reading and will read without being pushed.