Picture book Do You Want to Play With My Balls? looks like a regular children's book, but it features numerous sexual double entendres.
"Hey Louie! Do you want to play with my balls?"
"Wow! Your balls are so big, I can't even fit them into my mouth!"
"Let's roll them on Sparky's fur. Girls hate hairy balls!"
Do You Want to Play With My Balls was written by the Cifaldi Brothers. It's available to purchase on Amazon.
Source: BuzzFeed; photo: Amazon