While talking about law and homosexuality, I am reminded of a story of a washerman and his donkey. The donkey refused to move with the heavy bundle of clothes on his back from his house to the pond. The washerman nailed a carrot to a stick, which was tied in front of the animal's mouth.
Demographic literature is replete with observations of an inverse relation between certain attributes of modernity and family size (Thompson 1929; Notestein 1945; Coale and Hoover 1958; Leiberman 1980, Srinivasan 1986).