There are two articles: 1. Castration & Life Expectancy: Eunuchs Live Longer Than Other Men, Study Shows (http://m.huffpost.com/us/entry/1910455) 2. Having multiple sexual partners shortens lifespan. ( http://www.everydayhealth.com/longevity/can-promiscuity-threaten-longevity.aspx)   I remember the average lifespan of emperors were only about 30-40 years. Eunuchs lived more than twice longer than emperors...