Emily Willingham joins me today to talk all about the evolutionary pressures that lead to the variety of penis designs we find in nature. Her new book, "Phallacy: Life Lessons from the Animal Penis" is available to purchase along with her other fascinating books on her website at http://www.emilywillinghamphd.com/Thank you for watching and being an inquisitive being.Learn more about your ad choices. Visit megaphone.fm/adchoices