It’s cause of desensitization, his brain doesn’t get satisfaction from normal sex due to porn and intense dopamine release. His fetishes only get darker and darker from doing age play making models wear pacifiers etc. Over time, "normal" or less intense pornography may no longer provide the same level of arousal or satisfaction because the brain's reward system has adapted to expect higher levels of stimulation.
It’s like how someone might need stronger coffee or more sugar to feel the same effect after regular consumption. In case of porn, the brain seeks out novel, shocking, or more extreme content (e.g fetishes involving slapping, spitting, cnc, domination & pissing (he does all above) or other hardcore themes) to achieve the same dopamine .
This is what happened to Diddy. Most pornstars need help or they eventually get consumed and can’t draw the line and just end up going to jail or exposed. Drugs etc makes it worse