Thank you Freya! 
It would be interesting to know how you rated your findings, btw.
Seeing as how there is so much screwed up shit out there, though, I wonder a bit about the conclusion that those who watch it are genuinely 'in denial'. It's likely that a lot of consumers have extremely limited experience of real sex, so clear expressions and a general atmosphere of pain, fear, boredom, aggression in the porn they see are just what sex is to these viewers. Which I guess goes back to the problem of porn's effects.
Thanks also for the definition, BrandyButterfly. I think it's a good one. I also think the world is an infintely better place for the work of Dworkin and MacKinnon, and not just in relation to their arguments about porn. (MacKinnon was an extraordinarily smart, talented, brave and astute lawyer who did a huge amount for women in the workplace, for example. I think we're all much better off for the work she did.)
I think the problem with that definition, though, is that it's potentially so broad that it becomes very subjective. I say this because some of MacKinnon's writing can be understood as an argument that the mere depiction of women's bodies for sexual gratification is in itself degrading to women. It can actually feel as if quite a bit of intellectual contortion/distortion needs to be done in order not to read her arguments in this way. Although it's probably worth remembering that at the time that she was writing, many rights that many of us take for granted had not yet been secured (by MacKinnon herself, it has to be said).
And since there are, of course, lots and lots of women who love erotica that gets pigeonholed as porn - because it's 'adult entertainment' - there's the (not completely unreasonable - but not really accurate either) perception that anti-porn arguments somehow 'silence' or dismiss women (and men) who are into 'ethical' porn/erotica. (Well of course there is, it's evident from this thread.)
Christ, I sound pompous in this post. Oh well.
My point is ... clearer definitions needed.