Holy moly, the genre is old. It has been around I would guess as long as any. I can’t speak to the exact content you seen, but a lot of that is staged. Just like the coeds or gals met at bus stops and laundry mats and end up going home or in private with some dude they supposedly just met. How many women do you know who would not be freaking if some dude came up to speak with them, and someone else if filming away? That to me would be a tip off to the rip off. If the girl was not asking a mile a minute questions about who he is and why the hell he is taping, it is staged.
The drunk and passed out thing, as well as rape-fantasy, is basically just that; a fantasy. If you look at it in connection with real life it would seem odd and crazy, same as those who would be tied up and whipped. It is like why would someone want to be in a position like that. With stranger(s) you do not know and trust or involuntary it would have no fun. If you know what is happening and that no real harm will come to you, then the fantasy, the anxious anticipation of what your partner has in store, adds spice to the encounter. For some it is knowing they have pseudo control over the bound partner, that feeling like they are actually forcing their will, even though it is really given. Some might be because they are the boss, and order people around all day and being bossed has something to do with keeping them balanced or grounded.
The fantasy of making merchandise if someone passed is like getting away with something you would ordinarily not. I did not see the footage you seen, sometimes they get really young women and make them up to look even younger, then it is like a double fantasy where you are taking innocence and at the same time doing so undetected.
There is a lot of different type of porn out there. I was looking up computer art and one of the links ended up with adult digital art. Because they had varying styles in the gallery I lingered a bit because it was interesting how some were pretty slick, almost like an oil or airbrush painting, and others looked like plastic people that had that floaty look, and some worse than that. Then it moved to digital hentai (I think I spelled it right) from Japan, they type with Japanese writing on it and pixilated penetration. That could be a whole thing in itself. Some of that Japanese adult art can be seen as pretty brutal to many Westerners. Having hentai where old Gray Japanese men are making merchandise of young girls in Cracker Jack styled school uniforms would be too much for most Yankees. From what I could see, it seem to be fairly popular over there. It is a cultural fantasy they have, I guess. I say beware, you might have seen something made to look real, and you fell for it, when all along it is a fake as a $55 dollar bill.