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While sex will never equal a kickboxing class or a session of strength training, the fact that you're getting some sort of a muscular workout is undeniable. The human body has over 600 muscles and during sex, "we're releasing and contracting all the muscles within the body," says Patti Britton, PhD, author of The Art of Sex Coaching and past president of the American Association for Sexuality Educators. Arms, butt, legs, core muscles -- they're all getting used. And while some positions have better toning payoffs than others, as long as you're putting some effort into it you'll be burning calories from start to (ahem) finish.