>>76457705
You should masturbate when you are legitimately horny and have a firm erection. By legitimately horny, I mean you are actually lustful.
Too many guys just jack off when they're bored because they're addicted or want a dopamine hit and use porn to keep their arousal up. That's not really good. It's not really bad either but it can quickly spiral in to an addiction, and make you overly dependent on porn for you sex drive and arousal. It also just physically feels worse. Jacking off when you are legitimately horny physically feels night and day better than just doing whenever you're bored.
I guess to summarize: you should be aroused enough naturally to the point that you don't need porn to maintain arousal or an erection. Your imagination should be enough. That being said, a little porn (a couple images or a single video) is perfectly fine, and is probably for the best if you're a single dude and otherwise have no other way of seeing naked women. Because that will make you go insane.