Lionel Trilling in his classical essay on the first volume of what is now called 'The Kinsey Report' stated, 'The Report will surprise one part of the population with some facts and another part with other facts'. No doubt he was right. This reviewer must admit that in spite of all preparation for the reading of the second volume, she found it astonishing. In this review, therefore, an attempt will be made to account for some if not all of the surprises which this presentation of a large scale study of sexual behavior holds for readers who are well acquainted with the practical and scientific