We all know how sex begins: a dimly-lit room, a come-hither smile, and a surfeit of parasol-shaded cocktails. But long before before all that, the gentle currents of the ancient sea floor set the mood. It was there, 570 million years ago, that two ropy sea creatures found each other and changed the course of evolution.Hear how sex began and where it's headed: if you think your love life is mechanical now, just wait until you're cozying up to titanium skin and the latest emotion software.Plus, everything you always wanted to know about modern sex research, but were afraid to ask.Guests: Mary Roach - Author of Bonk: The Curious Coupling of Science and Sex David Levy - Artificial intelligence researcher and the author of Love and Sex with Robots Mary Droser - Professor of Earth Sciences, University of California, Riverside Less