I'm loving the game so far, I chose to play in omniscient mode and I'm glad I did otherwise I would have missed most of the character development and internal strugles of the girls. My only complain is the porn forum, I feel there is a dissonance (pun intended) in the fact that the MC is not interested in porn, cheating or even NTRS and seems like a genuine honest guy and not a pervert so why would he check on the forum about those things? There is no narrative justification, it's purely a gameplay device so that the players that choose the mystery mode can have some snippets about what is going on behind their back.
He has exactly two scenes where he conveys his thoughts about the Forum, when he first gets invited and day 45(ish?)
When Arianna first has sex with the guy and he posts it
His first thought, "I'm going to be alone for a while, so some 'relief' might be welcome." So he's not anti-porn, but he wouldn't consume it under normal circumstances. Also at this point he doesn't yet know that most of the content is going to be guys pursuing women who are otherwise spoken for (it is also technically not the main idea of the Forum itself, but it "just so happens" to be the major theme at play)
His second thought, "I don't know why I keep looking here, these people are horrible, but I can't stop watching for some reason". He's intrigued for reason's he can't quite understand. We can contemplate any number of reasons that may be, but at this point it's guesswork. MC's inner thoughts are not explored enough in this game to really psychoanalyze him that much. I do kind of wish after seeing various images or videos posted we'd get some of his thoughts.
At the end of the day though, it really is just a gameplay tool to let us, the player, get a view of the action which is ultimately why we are here. Unfortunately there's little that can be done to both make hidden sex available for player consumption and also logically hidden from a PoV character's view completely. Some other games I've seen use dream sequences or memory loss as a device, but those can be pretty heavy-handed solutions.
Situations like this call for a little bit of "suspension of disbelief" on our part. Often times, this genre already requires a healthy dose of it because many times the tropes or framing devices commonly used are unrealistic from the start. So for this game, having the voyeuristic Forum be really the only spot where I feel I need to suspend my disbelief is welcome.