Sex doesn't burn as much energy as you think.
Getting busy can get our hearts racing and make us feel short of breath, so it makes sense that we'd assume the act burns a fair amount of calories (most people think that number is between 100 and 300 per romp). But when obesity researchers set out to dispel some unfounded myths about weight loss, they determined that most of us burn only around 21 calories during sex
—about 14 more than if you and your partner spent the same amount of time vegging out on the couch. There are plenty of reasons sex is good for your health
, but getting a cardio workout isn't one of them.