Alfred Charles Kinsey bestrides the sexological world like a giant. His two reports on the sexual behaviour of the human male and female respectively (1948 and 1953) have no equals before or since in their scope, thoroughness or the richness of their data. Kinsey has been criticised in his methods (so have Marx, Darwin, and Freud); but where is the sexologist in the modern world who does not owe a debt to Kinsey? All serious sexological social surveys, all compilers of statistical and other information in this field, all specialist writers on one aspect of sex or another sooner or later have to acknowledge the pioneering work of Kinsey at the institute he founded at Indiana University. There can be no doubt that the headline-making work of Masters and Johnson is well grounded in the firm empirical approach established by Kinsey.