The Guardian newspaper takes an in-depth look of this and examines the perspective of relationship expert Esther Perel. Her final quote resonates, when she says...
"At all four corners of the world, at this very moment, someone is either cheating, or contemplating cheating, or listening to the stories of someone else who is cheating, envious of that person who is in the throes of an affair – or maybe they are the lover in the affair… With every marriage, with every relationship, comes the possibility of an affair. It always will."
It's one of those quotes that could well be cited for years to come, it neatly sums up how things are in the realm of marital affiars and our understanding of them. You can read the full article here