Me thinks you're spot on. Therein lies the appeal of porn. I can log on to XH, fantasize, press the tip of my vibrator on and around my excited clit and enjoy a pleasing orgasm simply looking at sensual and erotic videos!
Good! It has it's logic if you think about it. We masturbate a lot and our main source of stimulation are pictorial representations of people we encounter but have not the courage or possibility to approach
Your explanation aroused me - I guess from a male perspective masturbating to completion over represenations of celebs, family, school acquaintances or office colleagues seems a bit over-the-top but nevertheless a turn-on...
I'm a guy myself and never understood it either. Must be the naughtiness of spreading our cum on 2-D representations of celebrities or people close to us who would otherwise be inaccessible irl, like family members, schoolmates or work colleagues, but as I said it was never my thing like I was never into cumming over sex dolls as well