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Many people will probably agree that sex is one of the most fun and safe sports around - as long as you remember the condom. It gets the pulse up and both sculpts and stretches most of the body's muscles - all in all a fun alternative to the gym. A woman (60 kg) and a man (80 kg) will each burn around 100 calories during 20 minutes of intercourse if the average pulse is around 100 beats/minute. If the puls is at 140 beats/minute, they will burn almost the double.