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 The heavy breathing and elevated heart rate that occur during sexual arousal and orgasm help keep tissues and organs healthier by circulating oxygen. As an exercise, it burns off just slightly more calories per minute than playing tennis.A study led by Graham Giles of The Cancer Council Victoria in Melbourne concluded that the more men ejaculate between the ages of 20 and 50, the less likely they are to develop prostate cancer. Kinsey reported that sex reduces stress, and that people who have fulfilling sex lives are less anxious, less violent and less hostile. In the 1970's, a study at Duke University found that the frequency of sexual intercourse for men was associated with lower death rates, and that the enjoyment of sexual intercourse by women was associated with a longer life. Orgasms boost infection-fighting cells up to 20%. Psychologists at Wilkes University in Pennsylvania found that students who had regular sexual activity had a third higher levels of immunoglobulin A, an antibody which boosts the immune system and can help fight colds and flu. Research done by Dr Winnifred Cutler, a specialist in behavioral endocrinology, indicates that women who have intercourse at least once a week are more likely to have normal menstrual cycles than women who are celibate or who have infrequent sex.
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