Their way of working became a model for other porn studios.
A lot of these sites are premium services though there is a selection of free access deals and amateur content.
Puzzy Power was a Danish porn studio founded in 1997 and was a subsidiary of the mainstream company, Zenotropa.
German porn also features some of the more extreme content you'll ever see.
You can trial the service for free for 21 days and members get access to a large library of videos and photographs.
The country has been home to many European porn studios over the last few decades.