Science has always been desperate to find a way to prove sex is a form of exercise, but its really not any better exercise than laughing or doing karaoke.

Live Science has the results of a new study by the University of Montreal revealing the number of calories burned during sex.

The answer is: a man burns 4.2 calories per minute during sex while a woman burns 3.1 calories.  That's approximately the same amount as walking or ballroom dancing.

So based on standard of two minutes for some, a man would burn 8.4 calories and a woman 6.2.  That averages out to about two-and-a-half M&M's  and a woman would burn off almost two.

But if you are like me and have the stamina of a rock star and can last an hour, a man would burn 252 calories and a woman would burn 186.