The scenes you described and how they're handled is by design, my game has no narration, except for the very few black-screen messages that are absolutely needed, so I also prefer not to have narration during sex scenes telling how characters move their body parts and things of that nature either. There's also never any girl's inner thoughts or anything that happens that doesn't involve the player/the player can't see. He is also rarely even shown, as most of the game is in POV.
I do agree with the foreplay suggestion, I started adding more of it as I got better at writing the scenes, so I'm definitely working on it.
The world-building part also goes with the no narration thing, but I also don't want to dump too much information on the player at once. I prefer if they notice stuff by listening to what the characters say, like you mentioned. I know this isn't preferred for those who don't fully read through my game, but there are hints to help those kinds of players out.
No worries, I appreciate this kind of thought-out comment, and thank you very much for liking my game enough to write it!