As for the shower and peeping scene, i really felt like being polite to them (once MC notices the wanker) is very unnatural (she just says OK please close the door). I have a strong feeling, that the author knows about it and will extend the scene in next updates.
Yes, you are right sergslogin, Those scenes will be extended soon.
Also getting angry shouldn't be a decision maker for the rest of a game, after all she makes a decision to close the door or not every time. Plus if a once spotted peeper shows his real voyeur character and ignores her polite requests and comes watching again, can potentially lead to new scenes with own interesting positive or negative outcomes in their relationships.
Again, yes
It's about balancing their relationship with the character. If she gets angry, their relationship deteriorates. If she is polite, it gets a bonus. I put that option just because some players may want that character to peep her and get smashed as a result. The effects are rather small right now (+1 and -1). In the upcoming versions, the males may try to masturbate, for example, the penalties and bonuses will be higher for those scenes.
The semitransparent glass idea is a good one. It breaks immersion to change the bathroom completely all of a sudden. But, another application for it occurred to me after reading your comment. I'll see if I can do it. Maybe I can find an "immersive" way to change the current bathroom too.
Thank you for the idea sergslogin, it's a good one