Can sex be a workout?

( When I think of the ultimate sex workout, I picture the scene from “Mr. and Mrs. Smith” where Brad Pitt and Angelina Jolie throw one another around their kitchen for an hour. Unfortunately , not every sex experience is quite that … well, high-intensity. But how many calories do we really burn in the act?

The rumor: A bout of sexual activity can burn between 100 and 300 calories

We hear all the time that sex is a great workout, but what are the hard facts? How much sexuality is deemed exercising? On a scale from fast asleep to Brangelina, where does the average sex encounter lie on the calorie-burning scale?