Hmm, it has a mix of both answers. Curiosity is one thing but if the reason you happen to be watching porn is BECAUSE your spouse is not giving you the kind of attention you need then that's when you must speak to him or her about how you feel. Other than that feel free to watch all the porn in the world, maybe even with your spouse if that's what it takes to set a mood or just plain taking notes for future references. Whatever those references may be.
when most guys watch porn, it doesn't mean they're interested in someone else. usually they have two entirely different channels for love and sex. they don't necessarily become emotionally attached to who/whatever turns them on like some women tend to do
personally, I wouldn't like it if my partner started getting into porn (not only because of that little fact about women, but also because I don't feel comfortable with porn-watching anyways)
But what if it's BOTH? OR NEITHER!? Porn is a placebo for real intimacy, but I don't know if I'd call it 'cheating' - as long as your partner isn't violently opposed. Like... with knives and swords and tazers and such.
I don't consider it cheating, but looking at other women that way can sort of open a man's mind to looking at women in real life that way. It may not always lead to cheating, but it seems kinda low. Porn should only be viewed by a married person when they don't have access to their lover, I guess?
I don't think its cheating, because your not taking someone out instead of your wife. However, what is concerned is what are you think about your wife and other women? Also ask if this is an addiction that is taking over your life? That doesn't changed when your married, your single, your going out, etc.