I'm Ric Flair! The Stylin', profilin', limousine riding, jet flying, kiss-stealing, wheelin' n' dealin' son of a gun!
Evolution has programmed our brains to find two things particularly interesting, and therefore memorable: jokes and sex - and especially, it seems, jokes about sex.
It only works because we still amuse each other. After we have been working with other people, it is so refreshing to laugh unreservedly when we are back together again.