Cheating at work, affair with a work colleague, coworker, work mate

Cupid's Law says the lifespan of a relationship is 7 years...and many people stay with a company for longer that that. Is work the most likely place to commit adultery?   
If you're unhappy in a relationship, how do you chance upon someone else and get tempted to stray? On the internet, on holidays or nights out, or at work. We spend most of our time at work. We care about how we look and come across, what we say and how we say it, because we mix with lots of people every day, often making new aquaintances, and we want to make a good impression. It's no wonder a professional relationship with a work colleague can easily get intimate and turn into an affair if you let it happen.