It's an old question: Can a man and a woman just be colleagues, or friends, without taking it to the next level? It always starts innocently, an attraction that grows as they spend more time together. The couple enjoy each other's company, and the connection builds and feelings develop. The anticipation grows, even if they are married. Decisions are made. What if the line is crossed? The excitement of being together is palatable. Sometimes temptation wins. Will couples stray and give up their promises to be with someone else? The big question is will it last, and was it worth the consequences? Are all the good ones taken? Do vows have an expiration date? Find out.