I would like to ejaculate two thoughts into this thread.
One PRIMARY difference between traditional acting and Porn is that in Porn, the actors are ACTUALLY DOING what they appear to be doing on the screen. In traditional acting, they are just pretending, even when it is obvious that they are simulating various forms of sexual intercourse - just faking it. So in that way, Porn is infinitely more "authentic" than traditional acting.
Second, the thing that makes Porn different from reality is that in Porn (unlike in real life), the women are as horny as the men, and need no real inducements to "get it on." In real life, women generally have to be coaxed in one way or another to engage...not so in Porn. And this is why men like (use your own verb, if you like) Porn. It is the IDEAL WORLD when it comes to sexual congress.