I have actually discovered several different studies that prove this point. The one that seems the most thorough was done in 1997. It was titled Sex and Death: are they related? Findings from the Caerphilly Cohort Study, by Davey, Frankel and Yarnell. It was published in the British Medical Journal.
In this article, 918 men were studied between 1979 and 1983. “Mortality risk was 50 percent lower in the group with high orgasmic frequency than in the group with low orgasmic frequency.” A follow-up study was done in 2002 and published in the Journal of Epidemiology and Community Health. In that study, 914 men, aged 45-59 years old were tested and they found that, “Middle-aged men should be heartened to know that frequent sexual intercourse is not likely to result in substantial increase in risk of strokes, and that some protection from fatal coronary events may be an added bonus.”
These studies were conducted in the UK because so many men were suffering from coronary events and the researchers were trying to get a better grasp of both risk and preventative factors. I love this study because I think sexual well-being is an important aspect of a healthy life, man or woman, and this article proves that there are literally life-saving benefits to making more sex a part of your life.