Why?!

Why does it bother some women so much when their husband or boyfriend watches porn? I understand if it becomes too much or more like an addiction but I'd rather my boyfriend watch porn than go out and find it somewhere else. I joke with him about it. Like if I use his phone for the Internet and a site pops up when I'm searching for something else I say "oh yeah??" and laugh and then he laughs as well. Women and men both think about sex and when you're not with each other why not watch something and get yours and move on. It's not cheating. I've simply watched porn just to get me turned on more. My point in this post is, why are we making a big deal about something that is natural. Your man is not cheating on you by watching porn so get over it and move on.