I have an issue after the first 18+ scene in the bath, where the track with the splashing water and panting protagonist keeps going after the scene. Going into another option (checking out the bookshelf for example) doesn't end the track either. This doesn't happen if you don't go for the 18+ scene there.
Edit: Correction. Another track keeps going after the bath scene in that case: The sound of dripping water.
Edit2: It seems to be playing from the music track, not the sound effects or voice track. Maybe the game thinks it's supposed to be background music and that's why it doesn't automatically end?