The media frenzy regarding affairs and marital difficulties is on the rise. Affairs represent the most significant threat to marriages and families today. 17% of all divorces happen due to infidelity. 60% of married men will have an affair and 40% of married women. What causes people to have an affair when they love their spouse? There are many reasons. Some feel it is against human nature to be monogamous. Some feel it is related to brain chemistry or sexual addiction.