One orgasm a day may reduce risk for prostate cancer. According to a new study, one orgasm a day could reduce a man's risk for prostate cancer. Researchers claim that while an orgasm provides pleasure during sex, it may also reduce the risk for prostate cancer. It also provides a number of health benefits such as a boost in your immunity, better sleep, and can even protect against heart disease. According to Dr. David Samadi at the David Samadi Prostate Cancer Center in New York, Prior research shows a link between the benefits of sex and prostate cancer.