I disagree with many of your statements. I'm shocked that you would think that two people who swore to be faithful to each other, and then one cheats on their spouse, even thought that cheating is consensual, is not morally an issue. The other spouse is usually decimated by such an act. I'm unsure how someone could view this as NOT immoral.
The problem is that most sex workers, the grand majority, are either tricked into becoming sex workers, or they are forced into it. Most people in this country have been forced into it (note: this is a statistical fact). I do not buy your argument that the stigmatization is what harms the sex workers. People are the ones who harm sex workers. In certain European countries like Austria, prostitution is legal and "regulated" (as if that were possible), but there is a massive amount of sex trafficking going on, mostly Africans. The problem is that when men begin to view women as sexual objects, abuse almost always occurs. Sex is more than just a physical act, but an emotional act as well. If there is no emotional element, sex can be boring and un-stimulating. This is why porn producers have to add either a plot to their story, or they have to add some sort of humiliation to the woman. When men begin down this path of viewing women as sex objects, in order to continue to receive stimulation, they need to have emotional stimulation. The result is usually the humiliation part. So in prostitution, the end result is that women are almost always abused or humiliated. This is the way it is in most parts of the world. Human beings are not objects, but they have intrinsic value.
You state, "Maybe you should check your judgement". I would like to note that you are making judgments as well. I respect that that is your opinion, and you believe it, I hope that you would respect that other people have an opinion as well. My opinion is also based on facts, logic, and evidence, just as you claim yours is.