I see it as adult entertainment. Isn't that what its called anyway? Put it this way - someone into romance can watch The Notebook and it will make them cry and feel emotional. Would handing someone money and asking them to make you cry be the same thing as a romantic movie? No. Yes, its 'the same' in the same way the death penalty is essentially murder. I think you're just being pedantic if you pretend they aren't there.
Another example would be watching Chef Ramsay prepare and eat an excellent meal, then going to a his restaurant and having the actual meal cooked by him. Is it the same thing? No, its obviously different.
I have no inherent disrespect towards Porn Stars. They have lives like everyone else, they just have an interesting job. I have no inherent disrespect for prostitutes, although the fact that they are willingly breaking the law in my country means I would rather stay away from them.