2. Sex burns calories. Oh yeah, forget those fad diets and get busy gettin’ busy. A mere 30-minutes of sex burns 90 calories and while that may not sound impressive, at an average of three times a week, you’re burning 5 pounds in a year! Or, according to Forbes magazine, having sex just twice a week for a year will burn off the equivalent of seven huge spaghetti dinners. Seconds, anyone?