It has certainly crossed someone’s mind, at the moment they are having sexual intercourse, to question whether they are also practicing physical exercise. At least, in the minds of scientists, it has already happened. Sexual activity is a popular and enjoyable way to spend 32.38 minutes (more on that later). But is it physically intense? You can burn as many calories as jogging? Does it increase heart rate? Can it give rise to a heart attack? And if you have a big competition, should you remain chaste the day before?