Masturbation / Solo Play

I have been reflecting on something quite specific lately after stumbling upon some discussions on WebMD and a few other health forums. I can't quite recall which one specifically, but I came across some conflicting ideas regarding whether frequent sexual activity—whether through intercourse or masturbation—might actually be linked to an increased risk of prostate cancer. Does anyone here happen to have any insight or perhaps some medical clarity on this matter?
I managed to track down a bit of information here:
http://www.e-muskarac.com/sexologija/masturbacija

Based on the findings presented in this article, that claim I mentioned earlier actually seems to be debunked; however, I still believe it would be incredibly beneficial to hear some additional perspectives on the matter...