When you orgasm, your body releases chemicals that lower cortisol. A quick 10 minute jerkoff session before bed won't matter much but if you're watching porn all the time (gooning) then you'll have a prolonged lowered cortisol impact. Low cortisol over longer periods of time causes brain fog, fatigue and muscle weakness. You start to feel "flat" emotionally. This will have negative impacts in all aspects of your life.
Less people have close friends and the marriage rate is declining
Reversing these trends - reversing feminism and the like - would probably naturally lead to a decline in the abuse of media like this
Porn is without a doubt a symptom of the problem not the problem itself.
Give every man a hot woman who worships his cock and porn use would drop to near 0.
Consider this. Women choose not to worship men's cocks and this causes men to demand porn. Women then create porn for the men, getting paid in the process. Women say that they shouldn't have to worship a man's cock but then they worship men's cocks in the porn they create so clearly women have no problems worshipping men's cocks if they're getting what they want. Porn allows women to get what they want from men without giving men what men want. Women benefit from porn not men. Ending porn has always been a feminism issue. Fix the women and you won't have a porn problem.