Only about three percent of mammals are monogamous, mating and bonding with one partner for life. Unfortunately, scientists tell us humans are not one of these naturally monogamous mammals.

Maybe a few injections of vasopressin would help us. It has been called the monogamy chemical.

By isolating male voles before and after mating, scientists found that lifelong mating could be linked to the action of vasopressin. Before mating, the male vole is friendly to male and female voles alike. Within 24 hours after mating, the male vole is hooked for life.

When the chemical vasopressin kicks in, he is indifferent to all females but one. He is also totally aggressive to other males with a classic exhibition of the jealous husband syndrome.