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5 Reasons Why People Have Sex

1. Sex Burns Calories

Yes, knocking boots counts as exercise—and it sure beats the gym! Depending on how physical you get, sex 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 Sexuality. 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 sex in the study (from foreplay to orgasm) lasted an average of 25 minutes. “If you have sex for a longer period of time, you can have even more of those calorie-burning benefits.”

2. Sex Helps You Sleep

After orgasm, the body releases a relaxation hormone called prolactin, says Kristin Mark, PhD, director of the Sexual Health Promotion Lab at the University of Kentucky. “If you’re not feeling particularly tired beforehand, having sex and reaching orgasm may certainly help you nod off a little more quickly than you would have otherwise.”

3. Sex lowers your blood pressure and stress levels

In a 2005 Scottish study, volunteers were asked to record their sexual activity for two weeks and were then given anxiety-inducing tasks, like public speaking or solving math problems out loud. Those who’d had sex 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 masturbation or other forms of sexual activity.)
The study suggests two important benefit of regular sex, says Mark: Better blood pressure control, and better stress management overall. “Sex not only lowers people’s perceived levels of stress, but it also appears to helps them handle stress more effectively, as well,” she says.

4. Sex strengthens your heart

Regular sex may benefit the cardiovascular system in other ways. A British study found that men who had sex at least twice a week over a period of 20 years were less likely to have died from heart disease than those who got it on less than once a month. After 10 years, in fact, their risk of sudden death was 50% less than that of the group that had less sex, although that gap lessened over the next decade.
These sorts of findings only show a correlation, not causation, says Mark. “People who have healthy sex lives probably have overall healthy lifestyles.” Even so, she suspects there may be a connection: “Sex helps regulate hormones like estrogen and testosterone,” she says, “which impacts all kinds of systems in the body, including the heart.”

5. Sex may protect against cancer

Some studies have suggested that men who ejaculate more frequently may have a reduced risk of prostate cancer—although the difference appears to be very small, and others haven’t found a conclusive link.
The benefits may be clearer for breast cancer prevention, however: A French study found that women who had sex at least once a month were less likely to develop breast cancer than those who didn’t. And while the disease is rare in men, those who orgasm less than six times a month appear to be at increased risk of breast cancer compared to those who do so more often, according to a Greek study.

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