If a 150-lb person has sex for 15 minutes, he will burn approximately 72 calories, according to HealthStatus.com. Whether you burn this many calories during sex will depend on your weight, how long you have sex and how vigorously you move.
Exercise
According to "Fitness Magazine," certain sex positions can work your muscle groups and substitute a gym work-out. According to the magazine, you can work your abs, glutes, quadriceps, biceps, triceps, hamstrings and calves.
Time Frame
According to the University of Arizona, research hasn't determined for sure how long sex usually lasts. A normal time could be anywhere from two minutes to an hour. If a 150-lb person has sex for five minutes, he will burn 24 calories. If the same person has sex for 45 minutes, he will burn 216 calories.
Foreplay
Foreplay burns fewer calories. A 150-lb. person would burn 25 calories in 15 minutes of foreplay. Stretch foreplay out to burn more calories. The same person would burn 216 calories in 45 minutes of foreplay.
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