Will "sex-ercise" shed those extra pounds?

Found this during a recent search... (Believe it or not...this is actually a question I am often asked frequently as a trainer. So, I hope the answer proves helpful and fruitful to those of you who wonder).

"Dear Alice. You know how you often see that, for example, a 30-minute jog burns such and such number of calories. Well, I was wondering if there are any figures for sex. Thanks, Curious"

"Dear Curious: according to recent studies, the average 175-pound person can expect to use somewhere in the neighborhood of 150-200 calories during 30-45 minutes of sexual intercourse. Of course, this estimate will vary by amount of movement and vigor, as well as by type of sex (i.e., oral and anal sex) being had. Another source, Leslee Welch's "A Handbook for the Carnally Curious," states that 100 calories are burned during intercourse. It seems that you will not utilize as many calories as you would on the treadmill.

These caloric expenditure figures are probably in the ballpark range, since the energy used during sex differs from person to person and from session to session. Duration, intensity, effort, frequency, and position probably influence the number of calories expended during sex, as well as during any other physical activity. This may not answer your question adequately, but it does point out the difficulty of measuring an activity that cannot be standardized easily."