I am probably just old enough that this kinda ‘makes sense’, but back when I was growing up:

1. Porn ‘addiction’ was not at all a prevalent thing, in the true sense of an actual addiction. It was much, muuch more common that if you just had or looked at any porn, maybe a couple times a week or month, not to the point that it was actively interfering with your life… this was decried and stigmatized as an addiction. If you were a teen and had a porno mag, and didn’t throw it out after your parent found it, fairly good chance you are now a ‘porn addict’, time for an intervention from the local pastor.

2. Because of these more prudish, second wave of Satanic Panic type norms in the 90s and 00s… a gf with a ‘porn addiction’ would again likely not have a literal addicition, it would probably indicate just that they were an introvert, who is kinky/kink-curious, or even just sex-curious, had a manga that had some nudity in it, where nudity is potentially ‘her dress is too low cut’ or ‘a form fitting body suit is functionally nudity’.

Like, if somebody was being called a ‘porn addict’ in the 90s/00s… fairly good chance that just there was a story going around that they had watched or viewed porn once, and been caught.

Not saying theres 0 chance they were an actual addict, nor that just generally ‘seeking a porn addict gf’ would be totally non problematic…

But back when Pokemon was evil because it ‘teaches evolution’ and Harry Potter was Satanic because ‘Witchcraft!’ … yeah, porn consumption/viewing was often extremely overblown and pathologized/demonized.

And I do literally mean demonized, in some cases. ‘The demon of lust has possessed you’, type of shit.

They probably think porn addict = always horny = many sex