I thought this was interesting:

A study published in the British Medical Journal found that men who had sex less than once per month were twice as likely to die in the next 10 years, than those who had sex once per week. Researchers also found that having sex twice or more a week reduced the risk of a fatal heart attack by half for men, in comparison to those who had sex less than once a month, as published in the Journal of Epidemiology and Community Health.

Read about more benefits of having regular sex in this article