Some dudes claim that when they watched they got no attention from girls as apparently girls can distinguish a guys 'attractiveness' based on body language and as burns you out you are less attractive. You also release less pheromones when you watch as the body thinks you are already having sex.I think that's due to what they call "semen retention", I'm not sure how scientifically sound it is..but it's an interesting theory for sure. And it's pretty neat that it's helped with the brain fog and stuff; those symptoms are horrible to tolerate on the daily.
Other sites that might interest you to check out: yourbrainonporn.com and https://www.actualized.org/forum/topic/8664-11-years-of-depression-and-nofap/