One day young Billy opened the bathroom door and to his surprise his father was standing there naked, ready to get in to the shower.

Billy's dad said, "Billy, don't worry, as you get older your body will change, and just like me, one day, you will have a perfect penis"

Later that day Billy was playing truth or dare with little Sally next door. On a dare Billy pulled his pants down to show Sally, and said "Sally, don't worry, one day my penis will be three inches shorter, then it will be a perfect penis"!