The half everyone has seen
Two episodes of every series play without payment. They are serialised drama built on an adult set-up: a new housemate, a weekend visit, a door that should have stayed shut. Nothing explicit appears in them, in any title.
Whoever types this question has usually seen only those two. Their sense that the word does not fit is right about the part they watched.
The half that costs
From the third episode every series is adult material, without qualification, and stays there to the end. The third is also where payment starts, twelve tokens on most titles and thirty where a performer is credited, so the content changes and the paywall arrives in the same moment.
What actually differs between titles is how far each one goes past that line, which the platform never states. This site does: every series page carries a mark out of five, given once the paid episodes had been seen.
Made, not filmed
A model produced every frame; nobody was recorded and no set was built. That bears on the question because the word usually refers to a recording of something that took place, and here nothing took place.
Seven series pull in the other direction: each carries the credited, licensed face of a real adult performer, Riley Reid in three of them, Bonnie Blue in two, Sophie Dee and Mia Malkova in one each. A face lent under contract is neither footage nor a face used without consent. The remaining sixty portray nobody real.
Then it keeps going, which the word does not cover
This is the part the usual answer misses. Fifty-eight times out of sixty-seven, when the last episode ends, the character it was built around becomes a profile: you open a chat with her and carry on. The series was, in effect, an introduction.
Whatever you call the episodes, that afterwards is a different thing again. It is not a recording and not a story; it is a conversation. Nine series skip it and simply end, and the series page here tells you which before you spend anything.
So, in one breath
The unpaid episodes are drama with an adult set-up and nothing on show. The paid ones are adult material made by a model, twelve tokens each or thirty with a credited performer, and marked here out of five. And in most series the ending is not an ending: the character carries on.