On the African Savannah […] our rational male forebears wanted young and beautiful partners while our rational ancestors down the maternal line would have preferred high-status males. Have these preferences, like attitudes to sex, survived to the present day? Folk wisdom would certainly say so. In the song ‘Summertime’ from Gershwin’s opera Porgy and Bess, there’s a reason why Bess soothes the baby with the line ‘Your daddy’s rich and your momma’s good looking’ rather than the other way round. And how often do you hear of a twenty-six-year-old Chippendale marrying an eighty-nine-year-old heiress?

Tim Harford, The Logic of Life: The Rational Economics of an Irrational World, London, 2008, pp. 78-79