My friend's 6 year old son recently came up to me and asked me if I knew why girls don't have penises. I asked him why, and he said, "Grandpa says that they played with them too much and they fell off!"
A childhood belief about rude bits

others believed things like this
- "dildo is an extinct bird"
my 18 year old friend fell for that.— pebblezzz - I used to believe both boys and girls had penises so i thought sex was when they tied them together.Anon
- I actually asked my mother if mixing girls' poop and boys' poop would cause an explosion.— kraine
- Until recently, my friend believed that Richard Starkey was the fifth Beatle.— Spook
- I once asked a friend if test-tube babies had bellybuttons or not.
I was eighteen years old.Anon - When asked why he didn't finish eating the crust from his pizza, a young friend said "I don't eat the bone".— Dustin