Men who cheat often change physically. They go back into mating-and-courtship mode. Love handles disappear, posture changes, and muscle tone/definition returns. It's their body's primal way of preparing for courtship—readying itself to attract a mate. In addition, they start taking much better care of themselves and take a lot of pride in their appearance: New/pressed clothing, hair coiffed and primped just so, daily shaving (even on the weekends)... especially when leaving the house without you.