While the title of this book is misleading - in that it implies some way of "guaranteeing" that a marriage can avoid being vulnerable to affairs - it does provide a great deal of information that can be helpful in understanding and dealing with this issue.

The real strength of this book, however, lies in the "facts" it offers, including charts, graphs, etc. It covers many of the common questions people have about affairs, whether they've experienced this issue personally - or are simply interested and/or fascinated by this kind of data.