When you work up enough of a sweat to burn calories and fat, we call it exercise. So it should be no surprise that sex is indeed a form of exercise, says Dr. Yvonne Fulbright, author of The Better Sex Guide to Extraordinary Love Making. When this happens, you feel healthier and look better. Find out exactly how and where sex is toning you up. Plus, make sure you know the 27 things to guarantee a hot and steamy sex life.