Testosterone and oxytocin. Two hormones that have received a lot of media attention (and sales profits): testosterone as a supposed remedy to all that ails men; oxytocin as a supposed intimacy- and trust-inducing machine. But could testosterone have a dark side when it comes to our sex-related decision making? And can all the oxytocin hype stand up to scientific scrutiny? Dr. Zhana and Joe find out by talking to one of the preeminent researchers of the psychological effects of these two chemicals, Dr. Gideon Nave.