If you are an old-fashioned romantic, true love has a nice ring to it. Our films, novels, poems, and music are all steeped in the notion, with characteristics that include unwavering fondness and even selfless devotion. But does it actually exist, driven by our biological underpinnings? Or is it a myth that harms what could be a more realistic, and thus healthy, expectation of relationships? As American marriages teeter at historic lows, and attitudes shift, it is a growing question among both the single and the attached.      Arguing “No” is Helen Fisher, biological anthropologist and author of Anatomy of Love: A Natural History of Mating, Marriage, and Why We Stray. Arguing “Yes” is Renae Franiuk, professor of Psychology at Aurora University, whose research focuses on social psychology, including romantic relationships. Emmy award-winning journalist John Donvan moderates. Following this Agree to Disagree conversation, John sits down with Daniel Jones, Editor of Modern Love at The New York Times. Learn more about your ad choices. Visit megaphone.fm/adchoices