Why We Have Affairs — And Why Not to Tell

In her 30 years of counseling couples, Mira Kirshenbaum has discerned 17 reasons that people have extramarital affairs. In a near majority of couples, one partner will cheat on the other at some point. In her new book, When Good People Have Affairs: Inside the Hearts & Minds of People in Two Relationships (St. Martin's), Kirshenbaum explains the reasons and offers some helpful — and sometimes surprising — advice on how to manage the consequences.