Why do men and women cheat?

A cheating partner is something that every person in a relationship secretly fears. But why do people cheat? Why aren’t we all built to be monogamous? It appears that we may actually not be programmed to stay faithful and research is backing up that theory.

Studies carried out on both men and women have shown that the first flush of love is actually just a chemical reaction that literally fades after about a  year.

The euphoria, feelings of dependence, and stomach butterflies that envelop new lovers are apparently the effects of nerve growth factor (NGF), a protein that floods the blood-stream a the onset of a romantic relationship.