I didn't watch much of them but JimL2 once uploaded some porn parodies he'd cut the porn out of. Then he got banned and deleted his channel (in one order or the other).

Oh wait, the last three are still up because they're on other sites.

Left 4 Dead: http://www.poetv.com/video.php?vid=81732
The Big Lebowski (you may need to click the Original link): http://www.poetv.com/video.php?vid=81875
The Breakfast Club: http://www.poetv.com/video.php?vid=84531

You might gain some insight on the deleted ones from the comments:

Cheers: http://www.poetv.com/video.php?vid=79838
Batman: http://www.poetv.com/video.php?vid=79872
X-Files: http://www.poetv.com/video.php?vid=79969

They're usually pretty stupid and boring (not really entertaining), but a few of them have mindblowing production values for being shitty porn. I saw a Star Wars XXX one (which I'm amazed even exists without having been sued into oblivion) and it had some amazing make-up/costumes/sets for something that was literally just an excuse to have the usual sterile, shitty, angry porn that is all the rage these days.

The non-porn parts vary in quality. At the very top you have the Cosby Show parody. Little below that you have Sex Files. Around half of them are terrible.

The porn parts are boring because professional studio porn is boring. Who the hell has enjoyed that for the past 15 years?

The only one I've watched is a Star Wars one that had the highest production values of any porn I've ever seen.

But it wasn't silly and self aware of it's stupidity like this, it actually look itself seriously. Which made it a lot more amusing.

The puns are the best part of this!

I'm coming out of my shell! Dongatello! We're going to show you the secret of the ooze.

State college English majors wrote the screenplay, and they earned their money.