A man and his young son are walking together in a park, and they stumble upon two dogs mating.
The son asks, “Daddy, Daddy! What are those dogs doing?” to which the man replies, “Son, those dogs are making puppies. “
Few weeks later, the child walks unannounced into his parents bedroom while his parents are having sex.
The boy asks, “Daddy! What are you doing?”
The man, blushing, responds, “Well, son, we’re making babies. “
The child then says, “Flip her over! I want puppies! !”
This joke is included in the Black Book of Jokes. You can order it from here.