I think diet and lifestyle are definitely also a factor in the length of the flatline. Let's be honest, most people on reddit aren't really living healthy lives.
I think you're definitely on to something with oxytocin in regards to a a long term solution.
I still think that a reboot like I described above is necessary for someone who has been excessively masturbating to porn for many years. Just my personal experience, but from what I've read online I definitely wasn't alone here: After years of daily masturbation to porn, you simply can't get proper, hard erections anymore during sex, even if you reduce the amount you masturbate. Only abstaining from all sexual activity for several weeks will restore it. At least in my personal experience.
My other theory on how excessive masturbation causes erectile dysfunction is that if a person excessively forces ejaculation for a long period of time while having an unhealthy diet/lifestyle their prolactin will be chronically very high and metabolism will lower in response eventually decreasing DHT. And prolactin won't come down very fast without help once serotonin is also high. Not ejaculating for a very long time might work, but probably not if DHT doesn't start being produced again to healthy levels. Perhaps why the Nofap community notices a flatline.
So if strength training, sun, and adequate food aren't enough to restore libido, then DHT/DHEA supplementation would probably greatly speed up the recovery of normal erectile function by decreasing prolactin, serotonin and estrogen.
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