During the past decade, wife-swapping — that is, inter-couple sex — has grown to astonishing proportions in the United States. Thousands of married men and women now form a vast sexual underground, with its own rules, its own means of communication, its own self-justifications.

Now, in the totally frank words of a young husband and wife who already are veterans, we learn in full detail about this spreading movement. How a couple is initiated. How they find others. How they are led from simple sex to the most far-out practices and perversions. What it does to their marital relations and their personal happiness. And. much more, all of it shocking, fascinating, illuminating. Here is the naked, vividly human truth about the new morality in America today.