What's the reason for why Morning Wood disappears in some cases of PIED?

[scorpion1386]

I don't get it really.

 

[Numez]

its just the matter of how fucked up you get. some porn addicts cant get fully erected even while watching their most favorite porn of the moment. there are also porn addicts who have morning wood and erections with girls. 

some addicts even act out on their fantasies, try raping, gay sex, cheating etc. there are serial killers who mentioned porn addiction as their main fuel for killing. most of us dont get that far though.

its like with cigarettes, some people smoke 100 cigarettes per day, some stay at 20, my mother smokes around 10-15 (i used to be around 15) but they are all addicted.

why is that? its just is. why im shorter than someone, why is her hair dark. doesnt really matter. maybe its just to have more variety, more fun and more experience.

 

[Rumpled Sasquatch]

I'm no Dr but since they are related to chemicals released in the brain during REM sleep, I'd venture to guess that the "rewiring" done through the unnatural nature of PMO causes the brain to either stop producing these or else they are no longer strong enough to arouse our calloused neropathways from the over-stimulation and dopamine overload.   
Perhaps the same reason that the chemicals released when you kiss or reach 2-3 bases no longer give you wood