I disagree with a couple points you made:
Imo, porn is an easy way to spend time if you are horny and have nothing else to do. ..
With all that's going on in the world and even within the limitless faculties of your mind, how the hell does ANYONE ever have NOTHING to do lol. If you're too horny you can transmute that energy, especially when you could be doing something more productive. If you don't have goals in life that's fair enough but life itself is not so boring that you can never occupied.
It also forces me to confront topics like jealousy, i.e how comfortable would I be with fucking or having a relationship with girls like that. Imagine being able to say to a girl 'i'll want to fuck you even if you'd just fucked every other guy in this bar'.
Watching a movie (with the knowledge acquired here) dealing with this sort of issue to assess what to do/not to do I can understand, but I fail to see how jerking off to women on a screen teaches you how to deal with that situation in real life, the reality could be much different than what's being sold to you.
I saw one girl test her guy for jealousy at a bar (by slow dancing, touching, sitting on the lap and finally making out with a handsome but obviously gay guy) and the pain he was going through was apparent to all who noticed.
That guy's a pussy and she's cheating on him, unless they're in an open relationship she should be fired for that sort of behavior.