>>514770373
Longterm/permanent PNS only happens in a minority of cases.
With regards to your "for some reason", the reason is that semen retention crashes testosterone and cooming causes a surge in testosterone back to normal (or temporarily higher than normal overshoot in testosterone levels) which makes you extra horny and dick extra hard.
I learnt this in my extensive scientific research into my chronic condition (Because I noticed the same effect as you back when my body was still kinda working).