Oh, the plots are nonsense. But the sex is usually quite good. And the big orgy sequences at the end are excellent. They are quite well-filmed, too. There's clearly a lot of action going on all the time, so you get the sense that there really is an orgy going on.
People keep getting up, switching partners, moving from one body to the next.
A guy laying on his back with a girl riding his cock and a man fucking his mouth might find the girl abandoning him, only to have another man start fucking him. The man fucking him might stop, and the guy then mounts the girl's pussy doggy-style. The man in the girl's mouth might pull out, and let another girl replace him for some more pussy-eating. All this might be going on in the background, bodies writhing from position to position. The pairings are mostly duos, not a real orgy.