I missed that quote about mating. All of my birds are like Rupert. If you wanna watch, be their guest, none are shy. Lapis and Nube don´t like strangers and started doing their thing when my friend and her husband were here picking her birds up, they were sure to keep eyes on us all throughout.
The only exception was when Adelie and Sydney first were hitting it off, they would go to the corner and he would feed her, but would come running over if they thought I was looking
When I hear those little sounds, I just keep my eyes on my computer and let them have a little privacy.... though there are often spectaters of the feathered kind, which they also couldn´t care less about.