Shower sound should properly end with scene instead of looping into following scenes. Using the auto-saves, you can backtrack to that point (A in the load map) and the finish of that scene will kill the shower sound. Saves you may have made following that scene may still have the persistent shower sound until the shower scene is repeated (even the non-sex option should work).
I do listen to feedback, and I do want to make these games as enjoyable as I can. As the second owner of these games, my first goal was to reduce the many game-breaking bugs while updating them slightly to use the game engine's tools more effectively. I should have a patch coming next week that will address some of the repetition concerns and expand on the story more to fill those moments. Any input you can give me is appreciated, as I'm currently pre-production for Superspy Missions, the sequel to Superspy Steve.