You're not wrong. There's many scenes that are not in the Pervert menu that you can come across while in game. This is is a question for the devs to answer for sure. It'd also be nice if there were some hints to unlocking scenes like there are for "events" in the Progress menu. It's still a beta so we'll see what they do with it in the end. I ended up finding a Mega PDF to figure out how and where to unlock achievements for the bonus points in the following playthroughs.