I started studying the brain because I wanted to understand "the good stuff": sex, aggression, love. It didn't take long to realize that these are the subjects that most frequently make scientists blush, hide, cower, and heave laser printers at each other from across the faculty lounge.I explore these controversial subjects by applying Anton Chekhov's dictum to be an "unbiased observer of human nature." Nevertheless, it's tricky explaining to my neighbors exactly why I had to count the number of penises that appeared in five hundred erotic images.My books combine original data, multidisciplinary research, and a little chutzpah to illuminate the most incendiary and intimate software of the mind.