You can't help how you feel. More to the point, it's OK to feel how you feel, as long as you're willing to examine why you feel that way. That said, how you approach this needs to be based around certain realities and your comfort level.
First and most basic, if he knows his porn habits make you uncomfortable, he really should be doing his level best to make sure you don't stumble across it. We live in an age of incognito browsing; this isn't hard to do. I recommend against issuing ultimatums for the simple reason that they tend to make people resentful, especially if it forces them to hide things, but being respectful isn't hard.
Secondly, ask yourself why you feel threatened. Is it because of previous boyfriends? Is it jealousy? Ask yourself what, specifically, you're worried about, and make sure he understands your concerns.
As far as watching it? Only if you're comfortable doing so. If it makes you uncomfortable or unhappy, don't torture yourself. It's really more important to understand why you feel threatened by porn, instead of understanding the porn itself. You don't have to "get it" or like it. You just have to get how you feel about it and why.
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His porn habits should have nothing to do with you. They really aren't your business, unless of course he has decided to share it with you, or made it so you came across it accidentally. His sexual desires and porn choices are his personal business. You wouldn't want him knowing about your deepest fantasies unless you chose to tell him about them. Unless him watching porn takes over a lot of his time, don't concern yourself with it. All of my boyfriends have watched porn and enjoyed it and I haven't seen it or known about it unless i asked. Its personal, its private. You should in no way be threatened or think your allowed to have an opinion on it. I am sure you also masturbate. I am also sure that what you think in your head or fantasies you have when getting yourself off aren't his business. . Let him be. Its normal, natural. Watching porn with him as a couple can be fun, but don't think that by doing it together he is not still going to continue to do it by himself as well.
It's really kind of sad, but so many women have hang ups about masturbating. I wouldn't be surprised at all if she doesn't. We all entertain fantasies, but I can't say I'm sure she masturbates. And I think it could very well be the weird guilt issues and hangups that so many women have over there own sexuality that causes them to resent porn.
No, I use to be like that too lol scared of the guy watching porn. It's something most girls go through when they are younger and don't understand it. They think that it means the guy would rather sleep with the porn star or that he doesn't love his girlfriend. At least that's how I felt when I was younger....sorry and I did masterbate and I didn't have any hang ups. lmao Later on in life you realize that the guy does love you but his fantasies are unstopable. The woman walking down the street, your friend, the girl in porn...the list goes on and on. However, these are just fantasies and if he doesn't do anything about it than he loves you. However, watching porn with the guy is totally up to you and what you're comfortable with. If you watch it don't compare your body to the porn stars! Because she gets paid to look like that and prob hates her job. You get to have sex because you want to and it's your choice who you sleep with. That information helps me. Plus your boyfriend would never marry a porn star she's been around more than well everyone. Porn is more about fantasies. If it makes you uncomfortable tell him to hide it from you. I have lots of friends who told their boyfriends they don't want to see it lying around. I'm not bothered by it because I love myself and I think I have a great body. Plus any guy worth keeping would always respect me. I'm not threatened by porn in the least because I'm wife material and they're not. Sorry who ever wrote that question sounds like me years back and I appluad them. They sound classy. Whether or not she 'masterbates' is no one's bussiness but hers....just saying. I'm sure lots of men respect her too :)