There was an old lady who lived in a shoe,
She had so many children, her cunt fell off.

And now one from the "Cold War" desk.
There once was a comrade named Serge.
Who had an incredible urge,
He tried to make pass'
at Chairman's wife's ass'
So he was shot.

But getting back to rhymes appropriate for children, (right) but Toungue in cheek, here's another.
Old Mother Hubbard,
Went to her cubert'
To get her poor dog a bone'
But when she bent over'
Rover drove her'
Now the dog's got a bone of his own.