It is a saying of the Sumerians, 1900 years ago, who lived in what is now southern Iraq and goes:
"Something which has never occurred since time immemorial; a young woman did not fart in her husband's lap."
You gotta hand it to them there Sumerians: They were a real hoot. CLICK Now if we cold find a way to apply it to modern times. Let's say, the Bush girls?