Have there been any conclusive studies that found negative (or positive) effects from viewing internet pornography on a regular basis? Certainly a google search turns up a lot of results but most aren't scientific and relate to religion. I've heard claims about how no such company would sponsor such a study as it isn't profitable, or studies have not had enough men who had never viewed porn to continue.
Here's an article claiming porn is not bad but actually healthy and it does site a few sources but certainly seems biased. Here's a site on the negative effects of porn consumption however, a lot of the sited facts don't directly relate to negative (or positive) effects or porn itself (for example just because the brain releases dopamine when viewing porn isn't a negative thing).