A little boy and his father were walking down the street when they saw two dogs mating. The boy asked, "Daddy, what are they doing?"
"They're making a puppy," his father replied.
They continued their walk and went home.
A few days later, the boy walked in on his parents making love. He asked, "Daddy, what are you doing?"
"Making a baby," his father answered.
The little boy said, "Well, flip her over! I'd rather have a puppy!"