When you massage someone, the levels of oxytocin go up in the brain, and oxytocin is one of the chemicals that drives attachment.

Mothers really were not built to raise babies not only by themselves, but with only a partner. For millions of years, a woman had much more than just her husband to help rear her young... This whole idea of 'it takes a village to raise a child' is exactly how we're supposed to live.

As women in industrial societies join the paid workforce, they gain the economic means to depart unhappy marriages more easily.

Your sweetheart calls you by another's name. His eyes linger too long on your best friend. He talks with excitement about a girl at work. And the fire catches. Jealousy - that sickening combination of possessiveness, suspicion, rage, and humiliation - can overtake your mind and threaten your very core as you contemplate your rival.

At first I assumed hate was the opposite of love. But it isn't. The opposite of love is indifference.

Along with our many human propensities, we evolved a huge cerebral cortex with which we make decisions.

People have been looking for love potions since hunter-gatherer societies.