A CNN blog recently revisited the tantalizing myth that sex is a workout. It must be circulating pretty well right now on social media, as I have been asked by several people if this is true or not. The article is referring to a 2013 publication from the New England Journal of Medicine entitled Myths, Presumptions, and Facts about Obesity, written by a prestigious group of experts. Myth #7 states "A bout of sexual activity burns...