So I guess in truth none of these fetishes would be considered "common" in American porn. However, I think if you do a bit of underground searching one can perceive a definite attempt to explore Pee and Puke themes in videos.

Pee seems to be the most common. Euro versions (see Max Hardcore) contain plenty of this, but even American versions of mainstream movies like Hustler's Barely Legal often have it. Even Pee Drinking is often brought into movies under the theme of orasmic "squirting." I remember seeing Alisha Klass drink a lot of squirts.

Puking seems to be a little less common but gaining fast. The directors of most of the "face fucking" blow job series' now tend to leave the puke scenes in their videos. Videos like Cocktails have people eating puke and Max Hardcore features sometimes have even more extreme content. I remember seeing a scene where Summer Luv's mouth is held open with a speculum and Catalina barfs into her open mouth.

Now many of you may find Pee and Puke gross. But suspend your revulsion for a second and answer me this. Is there really much difference between eating/drinking Pee or Puke and Dirty Ass to Mouth Sex?

Personally, I've never quite understood lots of the pee and puke stuff because it doesn't seem to have much connection to sex, and thus I don't see what turn on it is. I suppose I can understanding why people like seeing drinking of "orgasm squirt" or fucking a girls head until she pukes. This isn't my cup of tea but at least it has some sort of connection to sex. However, there's a huge amount of material (in lots of mainstream American porn) featuring simple peeing and puking (on people). I'm not quite sure what the attraction of this is.

In the end I assume that the attraction of Pee, Puke, and anything having to do with scat is a combination of a "dirtyness" and a "humiliation" fetish. They all fill the same niche, though in my opinion some do it better than others.

At any rate, it seems to me that dirty ass to mouth sex (as in ass to mouth action where the girl's bung hole wasn't entirely cleaned out ahead of time) is a lot less extreme than a lot of the pee and puke stuff out there. This is particularly true in the context of all the regular ATM that already exists.

So what are so many mainstream american porn directors focusing on pee and puke, but none of them focusing specifically on Dirty A2M? Max Hardcore for instance. He does all sorts of extreme stuff with pee and puke, but has he ever done a dirty A2M scene on purpose? Not that I know of. Is there something about the porn director psychological profile that just gravitates toward pee and puke fetishes?