Having intercourse more often may help prevent the development of erectile dysfunction (ED). A new study reports that researchers have found that men who had intercourse more often were less likely to develop ED.
Not sure this is true but anyway sex seems to help.
probably is true because it seems the lower your libido the more likely you are to suffer from those problems in the first place…
also if you are not confident in performing you may avoid sexual relations
Maybe it’s just the other way round: Men who less likely develop ED have intercourse more often. 
eye_doubt