-Soul in this universe-
The Willow Of Darkness
Porn objectifies because it removes the question of the performer's agency. The person engaged in sexual activities is merely there, in most cases, to provide sexual pleasure to the viewer. As a person, within the context of viewing porn, those within the image aren't there as people. They are just a object of sexy image for the audience's consumption.
Even when a work of porn has something else in mind, such as celebrating sex acts and the participates decision to be involved in such an experience (which are somewhat rare), this objectification still tends to be there, as it usually comes from the viewer. No matter a creator's artistic goals or intention, those with an interest in watching porn are, most often, in it for the sexual images rather than anything else.
What's the difference between & image & the real thing if the real thing also looks sexy?
Porn is a commodity that can be bought once and experienced ad nauseum. It is cheap, easy to access, requires no social skills or emotional attachment, carries little baggage in a relative sense, and most importantly, is impersonal.
The viewing of porn is not the same as the interaction between two bodies. There is no choice, no consciousness, no consequence. It is not sex, but the idea of sex- a suggestion sold as an object in bright lights and sounds.
They are very different.