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." In other words, women are the gatekeepers in any sexual regards. This results from being less interested in sex due to lower sexual motivation and being a more choosy sexual selector. This results in men more likely making compromises out of sexual frustration, allowing women substantial decision power by strategically withholding sex (principle of least interest). This is one cause of hypergamy, i.e. the tendency that women date up.
Briggault's law was defined in 1927 by Dudley Buxton and was widely known in biological, sociological, and gender studies circles during the 20th century. In the 21st century the term became mainly relegated to the manosphere.
If sex is a female resource, then it will ultimately be up to the woman to decide when and whether sexual relations commence. This view of women as sexual gate-keepers was supported by Cohen and Shotland (1996), who computed correlations between when people thought sex should start in a given relationship and when they actually began having sex. For the hapless men, the correlation was not even significant (r = 19), indicating that their wishes and preferences were essentially irrelevant, whereas for women the correlation was very high (r = 88), indicating that sex occurred when they preferred. This study also found that men wanted sex to commence earlier than the women. Thus, women decide when sex commences, and the man’s role is to invest time, money, attention, commitment, and other resources until the woman is sufficiently satisfied.