One day Mary walked in on her Mommy taking a bath, she pointed at her Mommy's private area and said: Mommy what is that..?

Her Mommy replied: Well that is paradise.

A couple days later she walked in on her Daddy taking a shower, she pointed at her daddy's private area and said: Daddy what is that..?

Her Daddy replied: that is the key to Paradise.

"Oh", she replied.

Then she said: Daddy I think you should get Mommy to change the locks 'cause the neighbour too has a key.