Here's a link to an English translation of the website from Spanish
The article is for sex in general.
For males who are middle aged or older one of the benefits of regular sex and masturbation is that it helps maintain penis length. It's not unusual for a man who doesn't have regular erections to have his penis to decrease as much as 20% in length by the time he reaches his 60s. http://www.prostate.net/2012/latest-news-articles/why-men-experience-loss-of-penis-length/
A regular sex life will also help a man avoid Chronic nonbacterial prostatitis.