National Orgasm Day is July 31, so it seems like a good day to discuss the health benefits of an orgasm, according to Self magazine.

Orgasms are good for relationships, obviously, but they also burn calories and reduce stress. Sexual activity can extend your life as well. Lou Paget, the author of "The Big O" told Self about the health benefits of frequent orgasms.

Regular orgasms keep the vagina healthy, and having one during your menstrual period can protect against endometriosis, a uterine condition that can be dangerous and can potentially lead to infertility.

Another benefit of orgasm is pain relief. Studies suggest that an orgasm can double a woman's tolerance for pain because it suppresses pain without affecting sensitivity to touch.

Orgasms are also a heart healthy activity. Sexual activity has been demonstrated to reduce stress resulting from the surge of oxytocin that accompanies an orgasm. Studies show that this also lowers blood pressure among women, which can lead to heart attacks. The studies didn't include men, though it may lower blood pressure for both genders.

Sleep problems can also improve through orgasms. The hormone oxytocin, which the body releases after orgasm, triggers the release of endorphins, which have a sedative effect, allowing for a great night of sleep.

Sexual activity is also a good way to burn calories! Thirty minutes of sexual activity can burn up to 200 calories.

A recent study in the U.K found that one in four people surveyed felt pressure to have an orgasm every time they had sex, resulting in 27 percent of men and 69 (really?) percent of women saying they had at some point, faked an orgasm.

"Try not to get too hung up on it as this will only make the situation worse," Joanna Coker, a sex expert for Bondara.co.uk, told the Daily Mail. "The ability to have an orgasm is affected by many factors...to be at your sexual peak keep healthy, try not to get overtired and avoid too much alcohol."

In honor of the day, the Daily Beat has compiled a list of the best orgasms in movies.