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1. Sex may boost your immune system. Regular moderate exercise boosts immune function, which helps prevent all manner of illness. At Wilkes University in Wilkes-Barre, Pa., researchers surveyed 112 subjects about their sexual frequency. 2. It burns calories. Sex is moderate exercise. It burns about 150 calories an hour. 3. It lowers blood pressure. European researchers asked 51 healthy men and women ages 20 to 47 about their sexual frequency and then measured their blood pressure. As frequency increased, blood pressure decreased. 4. It may lessen the risk of heart attacks. Many men worry that having sex might trigger a heart attack. Yes, it might, according to a recent Tufts study, but the risk is tiny and affects only those who rarely exercise.  5. It might ward off prostate cancer. For eight years, National Cancer Institute researchers tracked orgasms and risk of prostate cancer in 29,342 men, ages 46 to 81. As orgasms frequency increased, especially during the men's twenties, p