How should I bring out a topic of watching porn to my partner?

Me and my boyfriend have been together over 4 years and we live in different countries which makes it harder. We see each other as often as we can (every month tho). And I dont mind him watching porn or atleast I think I dont, but Id like it if we would be able to talk about it, but I really dont know how to bring it up. I dont think its cheating as long as it stays on the internet... Any help/opinions?

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