Statistics about how many couples are impacted by one or more emotional or physical affairs are hard to believe, for obvious reasons, not least of which is that estimates vary so widely. They range from 20-60% of men and 20-40% of women having an affair at some point in their relationship. No matter the exact number, the bottom line is that a large number of couples experience this form of betrayal at some point in their partnership, often after that affair has been going on for a while.