Book excerpt: "Masters and Johnson's basic groundwork in sex physiology will now make it possible for medicine to assume a rsponsibility it has neglected far too long - that of educating its own. Through the authors' efforts, those responsible for sex education finally have before them clinical facts about one of the more vital aspects of human existence. [This volume] is primarily concerned with the sexual response cycles of men and women between the ages of 21 and 50, with emphasis on similarities rather than differences in their sexual response patterns."--Excerpt from the Publisher's Description.