Thanks for replying directly to my request/idea/wish
As others already said, I would also like to have it all in there. Maybe you can have a Gallery with a section "Scenes" (i.e. animations) and another section called something like "memories" or similar, which contain the little "sexy" situations which usually don't have animations, but are just nice to re-visit.
You can have a look at other games and get some inspiration. Either do a "quick and simple" Gallery which works with an entry in the main menu and which shows you a small preview picture. Clicking on it basically just starts the scene. Or you can implement the Gallery somehow in the game (clicking on the "diary" or something), so it feels more natural.
But honestly: My priority would be to first get a gallery at all, before making it nice. The basic work is the same: Having persistent safe entries to unlock and so on.
I also use the gallery to remember what has happened so far, in case the next update takes longer