Have you ever wondered how many calories sex burns?

The number may considerably vary from person to person as well as from one session to another. Yet, the study by researchers from the University of Montreal found that on average, women burning about 69 calories for a 25-minute session, while men burning around 100 calories. According to experts, the key to high-calorie-burning sex is to make it hot and long. And adding some moaning and sighing can help you burn extra calories.