The new edition of this highly-regarded book includes comprehensive discussion of the nature of an affair and the five types of affairs and their underlying dynamics. The author addresses issues regarding revealing the affair, management of the consequences, rebuilding, and treating an unmarried third party, as well as the host of complex issues regarding children and custody arrangements. New material for the second edition includes cybersex and the effects of new technology on fidelity in marriage; the effects of managed care on treatment; marriage to the third party; and a new chapter on affairs and violence.