I agree with Phlegmoscope, and I've voted for extreme filth based on the description. Harcore porn - at least what is shot today - gets boring after a few minutes, although some of the old Stagliano & Rocco movies are true classics of the genre. But then, Fashionistas falls into the extreme filth genre, I guess, it's way beyond the "reality porn" crap of today, Bangbus, BangBros, Captain Stabbin, and other declinations which almost always seem to feature some blue couch from Ikea and bad camera work, not to mention bad sex (performers, story, etc etc...) and is quite degrading.
"Classic" porn gets my vote, especially spoofs from other movies (e.g. the 70s porn version of Alice in Wonderland), at least there's a decent plot and the girls aren't pumped up with too much makeover that dribbles down as the scene goes on. Much more laid back (less "piston-work") and is even enjoyable if watched in totality - what a movie should be all about.
There are a lot of porn that is good but is mostly constrained to a confidential diffusion, that is , not in yr average outlets. A lot of low-budget but quality stuff, that can be found in the so-called "sex-positive" shops such as good vibrations or come as you are , to name a few. They're a nice change from your run-of-the-mill and ubiquitous Hustler or Anabolic fayre. Just my 2 cents.
EDIT: For some true extreme filth porn reviews (rather funny):
http://www.somethingawful.com/d/horrors-of-porn/
ANd a classic, lego porn:
http://drew.corrupt.net/bp/