I have an idea that the phrase 'weaker sex' was coined by some woman to disarm the man she was preparing to overwhelm.
Source: In Webster's Electronic Quotebase, ed. Keith Mohler, 1994.
-- Ogden Nash, (Aug 19 1902-1971), US poet; He was noted for off-beat poems like Candy is Dandy, But Liquor Is Quicker.