Since the early 1970s, when studies of testosterone first gained wide public attention, this principal male sex hormone has taken the rap for a range of characteristics or behaviors, including low intelligence, rape, and "road rage.” The truth is both remarkably more complex and more interesting scientifically. From prehistory to the present, testosterone has played a significant role in the development of human society as well as in romantic, marital, and parental relationships. It affects women as well as men in such areas as language ability, cognition, and spatial orientation. Interweaving intimate case histories with first hand scientific research, Heroes, Rogues and Lovers engagingly explains the animal within us all, revealing testosterone's function in human evolution and its role in surprising links between animal and human behaviors.