This week on the Cut, we’re sharing stories about cheating. After all — as the editors saw when we started working on this series — almost everyone seems to have one. Howthey found out(a letter from his mistress),how they got revenge(letting frogs loose in his house),how to catch someonein the act, and what it’s like being the other woman. Today, in an essay adapted from her forthcoming book,An Honest Woman: A Memoir of Love and Sex Work,Charlotte Shane reflects with great empathy and insight on what she learned about her clients’ wives.“I knew I usually had more in common with her than with him,” she writes. “Any person can be cheated on at any time, though it feels like a uniquely humiliating and female position to be put in. But the clients, almost all of them, made a strong case for the impossibility of male fidelity.”