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Answer: You can't exactly substitute a romp in bed for a three-mile run, but sex does offer some fitness benefits, says Laura Berman, PhD, author of The Passion Prescription: Ten Weeks to Your Best Sex -- Ever! (Hyperion, 2006). "You'll strengthen your quads, hamstrings, and abs and burn calories," she says.
Of course, how many calories you burn depends on the duration and, ahem, vigor of the activity. A moderate 20 minutes will burn only about 28 calories, 32 at a more energetic rate -- but you can burn close to 100 calories if the fun lasts for an hour.
Originally published in Fitness magazine, February 2006.