I recently came across this research: Ejaculation Frequency and Risk of Prostate Cancer: Updated Results with an Additional Decade of Follow-up. It has been alluded to a few times here and recently there's an interesting discussion lead by @learning in his thread Managing PMO instead of abstaining. He says And @Immature responds with a page on Your Brain on Porn which looks at an article surveying studies: One problem is that the survey paper on YBOP pre-dates the follow-on study I found: Evidence for Masturbation and Prostate Cancer Risk: Do We Have a Verdict?, July 2016 (here) Ejaculation Frequency and Risk of Prostate Cancer: Updated Results with an Additional Decade of Follow-up, December 2016 (here) The National Health Service (NHS) in the UK sums up the findings thus: (From here) I am not a medical doctor so lots of the research went over my head but the full paper is well written and is available online for free here (or the PDF here). These are the author's conclusions: I plucked up the courage today to mention this to my doctor (GP, general practitioner, not a urologist). He was not familiar with the research but felt if it did show causation then it was worth acting on, his phrase was "go for it". The paper does not show causation but the authors do have an interesting section on proposed mechanisms that may explain the association: Giving up masturbation has proved a valuable tool for getting me through to 489 days porn free, but I think it may be time to go back to masturbation and just focus on staying porn free. I am morally and emotionally against porn but giving up masturbation was only ever a tool for me. If it is a tool that might risk my long term health then I'll stop using it. I'll probably wait until I hit 500 days, that seems a good number. Oddly my counter will increase as I gave up porn six days before adding masturbation abstinence to the mix!