Most discussion of sexuality today assume that differences between men and women are basically insignificant and "socially constructed," to the degree that they exist at all. Dr. Steven Rhoads says that whatever we might like to believe, sex distinctions remain a deeply rooted part of human nature. In this book, he assembles a wealth of scientific evidence showing that these differences are "hardwired" into our biology. They range from the subtle (women instinctively carry babies on their left side, near the maternal heartbeat) to the profound (women with higher testosterone levels are more promiscuous, more competitive, and more conflicted about having children). Rhoads explores male/female disparities in aggression and dominance, in sexuality and nurturing. He explains how denial of these differences has affected phenomena such as the sexual revolution and fatherless families. But he also maintains that society is improved by discouraging some natural tendencies, like men's temptations toward predatory sex, and encouraging others, like women's greater interest and talent in caring for babies.