I hope you know this isn't personally directed at you. It's just debate.
Of course! 
I write replies in the hope that people might re-examine their beliefs. From my perspective if you can't support your opinion in a rational debate, it's not a productive opinion. Likewise IMO if you, as a person, are unable to hold a civil debate with a stranger who has a different opinion, you're not worth talking to. As usual with most forums, mumsnet tends towards a mixed bag of responses! This is all gravy.
I would say some work was dehumanizing but you seemed to suggest all work was dehumanizing! Did I read that wrong?
I guess my point was that all work is unnatural, period, and for probably billions of people, unenjoyable. Given that this is the case, why are we more consciously upset about the ethicality of pornography as an industry versus something like the electronic device or textile industries? Both of the latter cause far more damage, and on wider scales (strip mining, extinction events, child labour), than Porn, yet the forums aren't flooded with people deploring that their DP was caught buying an iPhone, or eating at McDonalds, and how it prompted a crisis in their relationship. What is it about porn as an industry that makes it such a magnet for vitriolic criticism, compared to other, more damaging industries, that we accept unquestioningly?
Not only that, but why do we label the end user of porn as a "creep" or "disgusting" for accessing the material, yet we don't label people wearing GAP clothing as "slavers" or "colonialists"?
"Don't pretend that people who don't like watching strangers fucking are automatically more ethical than people who do." Well we are more ethical in this one area, IMHO.
But that's a moral double standard, isn't it? You're asking me to treat you as being a better person than another person, based on your sexual preferences. Yet when someone else says that another person is better than you based on their sexual preference, you claim they're being unfair.
Hypothetically 
Let's say that there are 3 friends, A, B and C. Now A and B both enjoy having sex with each other. They also both enjoy performing for an audience. C enjoys watching people have sex. A and B invite C to watch, and C accepts. All 3 people involved in this situation are willing, consenting, and aroused.
You would say that in the above situation, someone is morally in the wrong? If so, who? Why?
If A and B then also decide, of their own free will, through mutual consent, to sell a video of their session with C (C does not appear in the video), does anything change about the ethicality of the situation? If so, how?
I'm aware that the above example is not indicative of the porn industry as a whole. A lot of porn is made in deeply unethical ways, that's beyond dispute. However you can say the same about pretty much anything, without feeling the need to castigate the end user, or condemn the whole concept or idea. Just because a lot of mobile phones are made in deeply unethical factories doesn't mean I insult people who use phones, or say that phones in general shouldn't exist because they're inherently evil.