There are some fairly realistic animated porn scenes. I think these are done by semi-professional artists (and probably involving a great deal of effort). But

There are some fairly realistic animated porn scenes. I think these are done by semi-professional artists (and probably involving a great deal of effort). But they tend to be... rather fantastical. So there's no mistaking that it is unreal. Right now we can generate static images which will fool most people. And the wizards behind such magic could conceivably model physical bodies. In fact, this is done in movies quite often now, but not sexually (as far as I'm aware).