I feel for you bro. Woman will never understand men (and vice versa) but she does seem extremely nieve. Does she think that pron is only watched by dirty old men. I think the only advice i could give you is to tell her she needs to speak to another woman, and not someone her own age but someone older and wiser.
She should also do some research on the internet
http://www.telegraph.co.uk/relationships/6709646/All-men-watch-porn-scientists-find.html
Good luck
This thread needs a poll on who watches pron and who doesn't (and pancake).
We started our research seeking men in their 20s who had never consumed pornography,”
makes it sound like they've been eating it