I could think of some semi-funny one word answers, but truly, I think it's called "boring."
Check out Debbie Does Dallas for some old school plot. I think there is at least one orgy in it. Bring your weed wacker though.
For something more modern, check out
Fashionistas(I'm sure I'll be banned from here for recommending that one

).
Anyway, those are not my particular cup of tea.
The very best plot porn, is
Perverted Stories: The Movie. 
