The real problem is not the negative effects that you get from watching a video one time. Really, you probably won't see any negative effects from watching one, except that from watching one, you want more and more until you either stop and get intense cravings for the next days/weeks/months or your ejaculate and still get cravings for the next days/weeks/months. I always tell myself that porn gives me depression, anxiety, and I don't need it. And it's true. A week or two goes by, then I forget about my depression because not watching it and not fapping makes me feel better. Since I feel fine, I think, why not just a peek. Then I fall back into my old patterns and feel shitty again. It's a cycle. When you feel okay, but you have a shit day, or you get bored, but your mental health is stable, maybe not great, but at normal levels, you take a peek. Then the pathway opens and your mental health becomes unstable so you tell yourself that you need to stop...and repeat...and repeat. It's not hard to stop fapping, and it's not hard to stop watching porn. The hardest part about quitting is convincing yourself that you will be better off without it, 24/7. Once you convince yourself, you stop for good because, if you no longer want it, you no longer crave it.