It's true that the sex is exercise but it's no interval workout, or even a light jog – you only burn about 5 calories per minute. Sex is often associated with heart health because the blood vessels in the penis are the smallest in the body. That means trouble below the belt can hint at bigger cardiovascular issues. Research out of Australia found that men over the age of 45 with severe erectile dysfunction and no previous cardiovascular disease were 60 percent more likely to go to the hospital for coronary heart disease and nearly twice as likely to die in the three-year study period. So sex for heart health is a bit of an exaggerated claim, but the reverse really matters.