I was very curious as to why a relatively small game was so large, turns out the reason the game is so big is because it is very high quality (I guess some would say unoptimized with quality gained compare to size bloat of asset), some duplicate possibly unused files, and how they did the h-animations.
random objects are very high quality for some reason, like the background when running out of the base, unpacked, that alone is 140mb if i remember correctly (it is more than 100mb for sure).
there are two duplicate unreal starter assets (that idk if they are even being used) that equal ~1.5gb unpacked.
the sex scenes are individual video files, with each sex scene phase being its own video, and each phase being anywhere from 50mb - 100mb, unpacked the sex scene videos are a bit more than 3gb all together.
(when I mean unpacked, i mean unpacked from the pak file, not just the rar. The sizes are already compressed a bit while in the pak file, so the sizes I mention are to give a general idea as to why it is so big, as long as you don't unpack the pak, it won't be as big as I mentioned, maybe, because the videos were weird, I just moved them out and I could view them, so those may not be compressed at all in there, idk)