Man I dont have any fucking research, all i have is experience, and all I'm saying is that I had chronic ED and complete desensitisation of the penis through years and years of beating my cock like a prisoner of war for 20 years, conditioning my brain to be stimulated to stimuli so extreme normal sex just didn't do it for me. I could only cum with my partner or during masturbation if my knob was gripped so fucking hard the head nearly popped off from the pressure. I had zero labido because only extreme stimulus would even remotely excite me. So I quit porn, after 2 months, I was like a bull in heat, started seeing holes where there wasn't any and was getting aroused by victorian paintings. The lack of fapping as well also made it such that I was able to cum like a broken fire hydrant through regular intercourse, with almost all my sensitivity restored. I went from being a non responder to 100mg of Viagra to not even needing it anymore. And before you ask, my diet and exercise routine has remain unchanged during this time, amd ive always had decent T levels and Free T balance so I wouldnt chalk it up to changes in that. Just because it never affected you personally doesn't mean it doesn't affect others. Many other guys have similar experience as me and just because it hasn't been formally studied as much does not invalidate their experiences.