>In this case, with its puritanism, UK is closer to the US than to West Europe.
No, it's not. What are you talking about?
The US is more like Western Europe, in fact the US is probably even more liberal than Western Europe, when it comes to porn. The UK is puritanical all by itself, and closer to, say, Saudi Arabia.
Here in the US, we produce all kinds of porn. California (LA mainly) used to be the hub for it, but it's spread out from there and now it's being made all over; you can find people looking for porn performers on any city's Craigslist now. We don't have any kind of "great firewall" to protect us from porn. We don't have proposals to make citizens get "ID cards" to view porn online. We don't have weird anti-porn laws against things like "face-sitting" (remember the flap in Britain a few years ago about that? They had women sitting on men's faces in front of government buildings to protest the ruling), or any other regulation on what kinds of positions are allowed to be shown in porn. It's pretty much totally unregulated over here. The industry does some internal self-regulation, but it's not government-imposed, and there's lots of small, independent producers (basically anyone with a camera) who aren't part of that.
Don't lump us Americans in with British prudery. We have some prudishness problems in parts of our society in "meatspace", but on the internet, it's the Wild West.