Not into the retention, the nofap BS, crystals, or mystic things. BUT, have been practicing tantra and yoga for many decades and can attest that it gives me benefit and I keep doing it. For sure has nothing to do mit porno though, sometimes if my wife and I have a Saturday morning together without work or kids or anything, we edge ourselves silly till lunch, all the while binging on a couple hundred pornos.
It’s a dude who can’t get it up in regular situations because he is so desensitized by highly graphic porno.
No fap/ semen retention probably does them good.