Correlation =/= causation but like I said p**rn is a big factor but only one of many.
The results of the studies you posted like higher levels of ED with young men, etc can also be because of lower test levels. Lower test levels aren't because of p**rn usage but because of environmental changes like xeno estrogens (PCBs, BPA, and phthalates)
https://en.wikipedia.org/wiki/Xenoestrogen and because of obesity, the massive use of birth control and it getting in our water supply,...
Look at the test levels of these "men", incredible:
The cause and rise of inceldom is a multi dimensional problem and imo there are bigger and more important factors in play than p**rn that play a role in this. Maybe I'll start a thread about it in the future. (I'll go even further and believe p**rn usage is a reaction of being incel and not a cause in most cases)
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Studies show that men's testosterone levels have been declining for decades. The most prominent, a 2007 study in the Journal of Clinical Endocrinology and Metabolism, revealed a “substantial” drop in U.S. men's testosterone levels since the 1980s, with average levels declining by about 1% per year.
https://www.forbes.com/sites/neilhowe/2017/10/02/youre-not-the-man-your-father-was/