TEDTalks, Helen Fisher - Why we love... and why we cheat. The science.

"Anthropologist Helen Fisher explains the bio-chemical foundations of love (and lust), explaining why we commit and why we cheat. She also delivers a grave warning about anti-depressants and the way they tamper with the natural course of love. Fisher is an anthropologist with Rutgers University, specializing in gender differences and the evolution of human emotions. Her most recent book is "Why We Love: The Nature and Chemistry of Romantic Love." (Recorded February 2006 in Monterey, CA. Duration: 24:13)"