The question is not why women have sex, but why it takes ‘one of the world’s leading experts on the psychophysiology of women’s sexuality’ and ‘one of the world’s leading experts on the strategies of human mating’ five years of research to state the bleeding obvious. This is the kind of popular science that you might mistake for one of those literary hoaxes that sends up the whole genre. 

Women have sex, Cindy Meston and David Buss conclude, for a number of different reasons. Sometimes it is because they are attracted to the man, sometimes it is for emotional closeness, sometimes it is because they are in love, sometimes they want to get back at an ex,