Why Do People Cheat—and Are We Wired To?

If you've ever been cheated on (or done the cheating yourself), the question "why do people cheat?" has probably occurred to you more than once. We talked to experts to find out more about the science behind cheating, from the psychology to the evolutionary factors behind cheating.

Cuffing season, wedding season, summer flings, biological clocks, midlife affairs—pop culture and peer pressure often make us feel as though love, sex, and relationships are all supposed to happen to everyone at a prescribed time and in just the right order. And when they don't, the problem isn’t that one-size-fits-all relationship boxes are silly, it’s that you must be doing it wrong. But that...