An Estonian Joke.

Little Johnny, wanting to know more about life, asks his father: "Daddy, what's between mommy's legs?"

"Paradise." his father answers.

Little Johnny's curiosity is only growing, so he asks again: "But then what's between your legs?"

"The key to paradise." his father answers.

Little Johnny retorts back: "Then you'd better change the locks, our neighbor has the same key!"

(Sidenote: In Estonia, Little Johnny's name is Juku.)