A little boy and his father were walking through a field when the came across two dogs doing the nasty. The boy, very curious about what was happening, turned to his father and asked him what they were doing. The father, trying to make his answer as subtle as possible replied, "They are making puppies."
Later that night the little boy awoke from his sleep and wanted a drink of water. He walked over to his parents room and caught them screwing. The boy, not knowing what was happening, asked his father what they were doing. The father replied, "We are making you a little brother." To this the boy said, "Turn mom over, I'd rather have a puppy!"