Ancient cultures, which held a positive view of sexuality, believed that the body is a temple. You receive your body to care for in this life. If you don't take good care of it, who will? You are at your best when you are healthy, happy, and balanced. And, of course, having a healthy body leads to great sex! In fact, aerobic fitness has been found to be one of the factors that contribute positively to both a man's and a woman's sexual experience.