Maybe more of a comment that a question, but there's a lot of video porn I've seen which seems to be kind of self-defeating, at least for me. The problem isn't the actors, or the action, which are often interesting or adequate enough. It's the framing stories, the scenes leading up to the actual sex, where I find them losing me.
One example which springs to mind was ostensibly shot in San Francisco, and featured someone playing a delivery person who, after driving about a bit, pulls up to a house to deliver a package. No-one answers the door, so after a bit, he tries the knob, finds the door is unlocked, and wanders into the house, and then wanders through the house, holding the package, upstairs and down, until he finally encounters the person, asleep. After just a brief moment of surprise, the package is forgotten, and the delivery man delivers his other package. While I liked the actors, and the eventual action, by the time they'd got round to losing their clothes, I'd sort of lost my ability to suspend disbelief.
One of my all-time favourites in this regard was a scene shot featuring a large bathtub, which had a very large open window next to it ... and which was placed in such a way that it looked like if one slipped in the tub, it would be quite easy to fall out the window. The hero of the scene was sitting in the tub, and there was a glass of wine sitting on the rim of the tub. Suddenly, a naked man climbs the tree outside, climbs through the window, and into the tub with the guy. There has been no explanation of who this is; he has not appeared before in the film; and to the viewer, this is a complete stranger to all intents and purposes who is climbing naked through the window, and getting into it with the guy who was already there. I can think of a number of things which might happen at this point in time; the two strangers almost immediately getting into sex, without surprise or introduction isn't high on that list. But the scene continues, and at a certain point, the camera pulls back, revealing that a second glass of wine has magically appeared at tub-side, no doubt for the naked stranger's benefit. Again, here. it's not the sex which is the problem for me, it's the supposed scene leading up to the sex which leaves me spinning.
Neither of these two films (I could cite others) were exactly low-budget productions. I guess I could turn this into a question by asking if this type of thing is less likely to appear, nowadays? I realise there usually has to be some kind of set-up scene to introduce the sexual parts of the film. Are those parts of the production improving, in general, or is one still apt to see things like this?