PMO vs PM. Differences for the body?

Hey!

I discovered NoFap 22 days ago and haven’t had a relapse since. I’m really happy about it and feel great! I started because I got worried with this one episode where I had a hard time maintaining an erection, so thought I’d look into it. Got worried it could be some sort of PIED, and so decided to stop because of that, just to be sure.

Since the whole point was to improve my sex life, I am only doing PM. I’ve read and discussed about the benefits from semen retention, but most people who do it say they felt tired, unfocused, depressed etc, but I’ve never felt any of those. I’m 22, have a really healthy and active life, and consider myself a quite happy person, so doing PMO instead of PM seemed unnecessary...

What are the main differences, considering I feel nothing non-sexual improving physically in my body, from doing PM and PMO?

Thanks!!!