First and foremost, almost all porn samples are what _instantly_ turn me off!
The Resurex track above there ... is a good example ... turns me off. I don't like porn in psytrance, really not. When it comes to that moaning stuff, I want no cheap samples and no expensive ones for me either ... please. Seriously, I do like what women can do with their voice, but when they moan around in psy tracks ... it just seems to me that the artist couldn't think of anything better.
There are only a few noteworthy examples -- intelligent usage ... the best one has already been mentioned (yes, Atmos - Klein Aber Doctor).
The story that I know (heard from somebody else here) goes, that Tomasz one day came home from a party where he was fed up with the sound (must have been a lot of repetitive stuff). Frustrated he sat down and watched TV ... and since it was late night, the porn movie came up where the sample was taken from ... "bitte seien Sie vorsichtig mit den Geschlechtsorganen" = "please be careful with the genitals" ... was obviously two people playing doctor. From that point on he decided to make his own sound ... and used the sample. He made a track - and that became Klein Aber Doctor, one of the first iconic and fundamentally different sounding progressive trance masterpieces.
Even if the story was not true, it's a nice legend. I think only Tomasz himself could answer that...
I do think, however, that the dialogue in porn movies can make up for some more good samples that I would even like a lot ... "warum liegt hier eigentlich Stroh" (sorry that only works in german) comes to mind.
I really would like to see more of that. Darn, maybe we gotta do this ourselves once again...