Main benefits, sex helps you stay fit and helps maintain a healthy heart, and that while no substitute for a workout, with a half hour of sex can burn 85 calories or more. Also, by having sex your body like you’re actively doing an aerobic exercise, like walking, running or skating and therefore increases the circulation of blood and oxygen circulating through your body. It also makes the lungs to oxygenate, lower your blood pressure and improve your posture.

Also, when you have an orgasm, releasing large amounts of a hormone called oxytocin, Which has several effects on the body, reduces stress and makes you feel energized (a), helps you sleep and rest better, and together with another hormone called endorphinMakes the feeling of pain is better, especially headaches, arthritis, and those caused by the symptoms of Premenstrual Syndrome (PMS).

In women, also may help regulate the menstrual cycle and help control urine, by causing the muscles of the pelvis to remain toned. While in the case of men, sex can reduce the risk of developing prostate cancer.

As if all this were not enough, sex improves the body’s defenses. In this regard, some research shows that having sex two or three times a week increases the antibodies. Apparently, our body develops by way of prevention, since during sex is an important exchange of bacteria.

Source:
http://www.stherbb.com/men-health/improves-erection-and-penis-size.htm