Has this ever been demonstrated in a placebo controlled study? Otherwise, you could say going to Hawaii caused ED/Libido issues.
I might be misunderstanding what you wrote there, but how can you have a placebo for quitting p**rn and fapping? Like, you think you've stopped those things, but in actuality, you were subconsciously still doing them all along?
Read the experiences from the online communities I posted below. It's from people addicted to p**rn/fapping, most of whom have some level ED. From their experiences with quitting p**rn/fapping, it's pretty much the consensus that stopping those things will improve erection strength.
http://www.reddit.com/r/nofap
http://www.yourbrainrebalanced.com/index.php?PHPSESSID=9ac0cdc4cbdd0fdb1b2d5a00aa4bf8ae&