If you’re doing it right, sex should always break a sweat—not just because you’re up close and personal with another naked human, but hopefully because you’re both putting in the work to get each other off. Anyone who’s been left panting or sore after vigorous sexual activity might wonder: Why slog it out on the treadmill, elliptical, StairMaster or bike if you could screw instead?

For years, most Americans have thought of exercise as something that has to occur in 30-, 45- or 60-minute increments (thanks, boutique fitness studios). But when the U.S. Department of Health and Human Services updated its recommendations for exercise in 2018, it declared that workouts of less than 10