I would believe that some are real amateur but Sorry to Say that true amateurs that join into sex or other doesnt exist, even those that seems amateur are not. For many reasons
1- The girl knows very well what kind of club this is before she goes , yet she went. It’s not like it’s a normal club and they got surprized in there.
2- They know that everything is being filmed and will be spread all over the internet, why the hell to take this risk? they can go to other secret orgy clubs without anyone even knowing, if they want to.
3- Legal wise, you cannot just take advantage of a drunk woman, and post her having sex online and profit from it, I think this means a very long time in jail in any country in the world. Someone might say, they make them sign a legal agreement before the event, well, if this is true, then it is not real anymore and it's just like any porn movie. no average casual next door girl will sign such an agreement if she has a problem doing porn.
4- Even if the girl has taken a decision that she will just watch and do nothing, she knows her face will be all over the internet in the middle of an orgy, again, she is not your typical next door girl anymore if she is ok with that.
The most importante reason are legally, all porn site have to respect the law in the US code 2257 about the record keeping requirements, so Its hard to Say, but REALLY TRUE amateurs that join in sex Whit male stripper at party hardcore doesnt exist. Maybe some in the oldest edition, but very rare .
I'm from Prague and believe me, there are a lot of amateurs. I know a few of them personally. Prague is not that big...