82:1.9

With the savage, the food supply was the impelling motivation, but when civilization insures plentiful food, the sex urge many times becomes a dominant impulse and therefore ever stands in need of social regulation. In animals, instinctive periodicity checks the mating propensity, but since man is so largely a self-controlled being, sex desire is not altogether periodic; therefore does it become necessary for society to impose self-control upon the individual.