The thesis of this book is that a traditional, Western (and therefore largely Christian) code of morality is not only suffering a decline of authority but fails to provide a satisfactory response to the profound alterations in the concept of the family, the role of women, and the ""population explosion"". The author discusses the ""cultural patterning of sex"", attitudes and practices regulating human fertility, the differences between human sexuality and that of other living organisms, and he describes the processes of human sex orientation. He deals at length with the problems women face in adapting to their new freedom and responsibility and he repeatedly distinguishes between moral observance and ethical conduct. He insists on the necessity for forming a ""sex ethic"" which will support an advance toward what he calls ""our enduring goal values"": the worth of the individual and the recognition of human dignity. There are few who would argue with Mr. Frank's identification of the problems, created by the changing status of the family and the ""population explosion"". But there are obviously those who would find his interpretation of ""traditional sex morality"" grossly distorted and his alternative -- ""creative interpersonal relations"" -- unacceptable.