Hm, very interesting replies here - and quite surprising, in some cases.
I should have made a clear definition of porn - I'm not talking Playboy images, but rather photos and films of humans engaging in sexual activity with each other. This narrows it down a bit.
Studies have shown that repeated exposure to porn results in porn losing some of its enticing effect - that's what the objective studies I've seenhave come out with. There are oothers out there too. Some, paid for by feminist groups, claim it degrades women and encourages sexism and rape, whereas others, paid for by porn advocates, state the exact opposite.
There is rampant sexism and inequality in porn. Females make more than twice as much as males. Except for tennis and some other professions, this isn't seen in many places.
An American acquaintance I have say the women actually doing the porn - the normal stuff - don't see it as degrading. They see it as a good job where they can earn a lot of money in a very short time span, which they then can use for whatever they want. The problem for them he claims is not that they find it degrading, but that other groups do and those groups apply pressure on the rest of society and that the pressure is coming from this idea that porn is seedy and evil. This is second hand knowledge though so I won't trust it too far (just as I won't trust second hand knowledge from the feminists I know).
Doesn't seem evil or wicked to me.
It's amusing how you can turn things around - in an argument with one of the feminists who argued that it was degrading to women and really using them, I asked if one could not see it the other way around. Smart women (and men) taking advantage of a biological urge that men are more 'allowed' to indulge in than woman in society in genereal. Essentially, women ripping men from money just because they have a sex drive. She said it was far out and reaching and it is, just as her argument that it's degrading to women is. It all depends on the situation and the woman at hand, I'd say.
If I had to choose between earning $750 an hour as a porn actor and flipping burgers for $7 an hour, I'd have to ask myself which is more demeaning and abusive. Just social constructs coming at play, I guess.
Will see if I can find some more independent studies, with some more meat on the bones.