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Now that I'm really thinking about it, mainstream American porn does have a lot of the same shit. There's no bestiality but it's not uncommon to see dog and horse dildos in porn. There's no scat but American porn does seem to have an obsession with watching girls push objects out of their asses. And we have a lot of deepthroat porn where the guy fucks the girls face so hard that she vomits a bit. Hell, we make fake alternative-age porn all the time, where they find the youngest looking girl possible and dress her up like a kindergartener.
This is all allowed in mainstream American porn, so I think German anon is right. If we had less laws surrounding porn and a more relaxed culture, we'd have a lot nastier porn being made.