A friend of mine has two daughters, ages 5-1/2 and 7. Her husband was getting into the shower when both girls walked into the bathroom and saw him naked. The 5-1/2 year old pointed to his penis and goes, "What's that?" Her 7-year-old sister answered, "That's a penis." The 5-1/2-year-old said, "I know what that is—what's the brown stuff around it?" The 7-year-old goes, "That's vagina hair, dummy."