s*x burns calories
Yes, knocking boots counts as exercise—and it sure beats the gym! Depending on how physical you get, s*x can strengthen muscle tone, increase your heart rate, and get your whole body working, says Justin Lehmiller, PhD, creator of lecturer in the department of psychology at Purdue University and author of The Psychology of Human se*uality. And according to a 2013 study in which volunteers wore activity trackers while they did the deed, men burn about 101 calories per session, while women torch an average of 69. “Relatively speaking, that’s not a huge amount,” says Lehmiller. He points out, however, that s*x in the study (from pre-intimacy to climax) lasted an average of 25 minutes. “If you have s*x for a longer period of time, you can have even more of those calorie-burning benefits.”
s*x helps you sleep
After climax, the body releases a relaxation hormone called prolactin, says Kristin Mark, PhD, director of the s*xual Health Promotion Lab at the University of Kentucky. “If you’re not feeling particularly tired beforehand, having s*x and reaching climax may certainly help you nod off a little more quickly than you would have otherwise.

s*x lowers your blood pressure and stress levels
In a 2005 Scottish study, volunteers were asked to record their s*xual activity for two weeks and were then given anxiety-inducing tasks, like public speaking or solving math problems out loud. Those who’d had s*x over the study period experienced smaller blood pressure spikes, and recovered from them more quickly, than those who hadn’t. (Only penile-vaginal intercourse seemed to have this effect, not self service or other forms of s*xual activity.)
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