From the replies on this thread I've rethought this and I've come to the conclusion that there are really two things that bother me about this.

One, he lied. About porn. And this is somewhat well known as the precursor to other actions that are disagreeable, like cheating and web chats and other things that I probably haven't heard about. I'm an extremely honest person to other people, even if I have problems telling myself truths I don't want to hear sometimes. And it's one of the most painful things I've ever experienced to have the person I care about lie to me about this. It has damaged my trust and may damage my feelings for him.

Two, he thinks my opinion of porn and his viewing it is a joke. This is not okay, even if we were both not seeing each other. As eskielover said, it is possible that he may look at other things I say as a joke.

It's even more possible in that we're from completely different backgrounds. My parents watched porn, I know they did and they never hid it from each other and they were, I can't quite find the word to describe it, they engaged in discussions(?) or shared with each other about it. I was really little when they would talk about it over mine and my brother's heads and I only figured it out when I got older and started reading my mom's books. From what my boyfriend tells me when I was trying to talk to him, all the men in his family had porn. What I'm sure of though, and that he can't seem to grasp, is that none of them ever lied about it or hid it from their wives and therefore even if it wasn't okay with the women it was tolerated, at least.

I'm a very possessive person. I know this, and have known for a long time too. I don't like it when people leave me, or ignore me or make me feel lonely or bad. On the other hand, people are people and one is not allowed to treat them as possessions and attempt to control them. I also have very simple reasons for doing things, and if I'm told I'm wrong then I will consider it and adjust my views when and if I see the merit of the other argument. On the third hand, or foot , people also have the responsibility to return the favor to me, to consider my opinions.

I mentioned before that I do lean towards viewing porn as cheating. However, I've concluded that this only extends to the situation of hiding and lying about it. If the situation was like the one with my parents then I don't see myself having a problem with it.