One of the big myths about infidelity is that affairs only happen in unhappy marriages or in marriages where something -- like regular sex or good communication -- is missing. But the research of experts like Shirley GlassSome unhappy spouses stray, and some never do. Many unfaithful spouses are actually happy in their marriages. An overwhelming number of affairs happen simply because people allow themselves to overstep emotional and physical boundaries with friends or colleagues, sometimes so gradually that they may not realize, at first, that they have taken a wrong turn.






