Orgasms increase the levels of oxytocin, the "love" hormone, and couples who have higher levels of oxytocin seem to enjoy greater intimacy and even reduced levels of pain. Sex is great for women experiencing PMS and that infamous excuse for not having sex, the headache, because of that oxytocin spike. Oxytocin is responsible for better sleep as well, which has a whole host of health benefits in and of itself. Finally, sex is good exercise. It may not sound like much, but a vigorous half-hour session can burn up to 100 calories. It definitely takes work to do it well and get a workout, but it can be done. And after 35 sessions or so, you can lose up to one pound!