An excellent look into the intricacies of infidelity. It is important to understand the psychology behind relationships on both sides of the isle. Perel breaks the solutions down essentially to 3 main categories; one type of couple atrophy and can't see daylight, second pair might be able to learn from the experience and continue the relationship, while a third sees this as an opportunity to develop entirely new rules (polyamory). Is monogamy natural and does polyamory provide a realistic solution or generates only other types of infidelity or overload of responsibilities?

There are no one size fits all solutions and each relationship is different. While the book becomes repetitive in the second half, I would recommend all couples to read it and discuss its findings.