Whether you're married or not, relationships - and the satisfaction tied to them - are extremely important for increasing men's and women's quality of life.

Women are naturally prone to compete over their mates.

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

A lot of people have been romantically in love with somebody who they feel wasn't appropriate to marry.

Real competition can drive up testosterone, which boosts libido.

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.

Men don't need linguistic talent; they just need courage and words.