Those are questions others have asked, and thus far sadly there is no answer.
At this point I'm thinking there's either:
1. An error in the game that prevents the buddy voyeur events from triggering when they should.
2. They're cut content from the game that devs forgot to remove from the scenes gallery.
3. It's content that was originally meant for the append, but got added too early, by accident.
4. Is bound to a specific title or set of H-stats, that no one's achieved yet.
If there's anyone here with a good enough understanding of RPGM gaming script, perhaps they could take a look under the hood and see what's going on, maybe even create a mod to fix whatever the issue is till OneOne1 can get to it.