When I told him it upset me and made me feel uncomfortable he basically ignored me. He blew me off and told me to stop worrying and nagging at him, and he wasn't going to stop looking at porn because he has been since he was 13 years old. When your boyfriend's appreciation of porn takes away from the intimacy you share as a couple, it's a problem that needs to be addressed. Otherwise, let it go. A lot of very happily married men enjoy looking at naked strangers.
Men are highly visual when it comes to sex and seeing dozens of naked women can be very stimulating.
It's normal and it's not about you. Be comfortable with yourself and let this fuel his fire of desire. He seem like a devoted, loving, caring, man who appreciates graphic visual art. The last seven months have been long distance as he just started graduate school in Oregon. I am finishing up my senior year of college.