Linux

Vertical video is better for content focused on a single standing performer, because it allows as much of the screen resolution as possible to show the body. Horizontal is better for a performer lying down or any traditional horizontal sex acts, for the same reason.

I'm probably reading a little too far into this, but IMO Gen Z is much less interested in "simulations" of intercourse and is more interested in something "real", i.e someone doing a dance. Intercourse feels like a fantasy, like you're supposed to imagine that you're the one having intercourse, it's that fantasy which is appealing. Something like dancing or dirty talking is more honest about what it is, since a video of someone dancing or talking is essentially the same experience as if they were actually there in front of you. I believe that because Gen Z is more digitally native than older generations, they see digital content not as a substitute or fantasy for a real thing, but rather as a real thing in itself, and the nature of the content they consume reflects that. Another example of this is the shift from real-life streamers who fake personalities but pretend that they are presenting their real selves, to vtubers - who implicitly acknowledge that they are playing a fictional character for their stream as symbolized by their avatars. The human streamers are a fantasy substitute for a real human friend, but with a vtuber the content does not pretend to be different than what it actually is - a pretend character putting on a show for your enjoyment. By acknowledging its artificiality and integrating it into the content itself, it shifts from being something "fake" and "simulated" to being something "real". To me it's the exact same dynamic manifesting in a different area.

Now of course, I do understand that vertical content also simply means you don't need to rotate your phone, and that Gen Z is almost exclusively using the Internet on the phone vs. the desktop as older generations will. But this too is essentially a reflection of the feeling that digital content is not an artificial recreation confined to a specific display area (a TV or computer) but rather perpetually available (your phone), as would be appropriate for something which has taken on the status of being real rather than fake. The two forces reinforce each other, imo.