Jesse Bering is the author of such books as "Why is the Penis Shaped Like That? And Other Reflections on Being Human" and "Perv: The Sexual Deviant in All of Us." He's also written for Scientific American, Slate, Das Magazin (Switzerland), New York Magazine, The Guardian, and The New Republic, and has been featured on NPR, the BBC, Playboy Radio.

Bering talks to Cenk Uygur about penis evolution, human sexuality, homophobia, "natural" sex, and more on TYT Interviews