Briffault's law is defined as follows: "The female, not the male, determines all the conditions of the animal family. Where the female can derive no benefit from association with the male, no such association takes place.". — Robert Briffault, The Mothers, Vol. I, p. 191
The Mothers: A Study of the Origins of Sentiments and Institutions, Vol. II, Vol. III, (1927) L. H. Dudley Buxton.