Are there any actual airline published rules on the matter of visitors in 1st class and allowing unwashed Y passengers to visit?
The way I see it, I own that F seat for the duration of the flight. If I want guests coming in to say hi, I can allow them up there. And if I want to switch seats or let someone take a picture in my seat, it's my prerogative.
What I don't really understand is why anyone else cares what I do with my seat. As long as nobody is taking away your seat, it's really none of your business what I do with mine. Most of the time on a flight, whether in 1st or coach I am either asleep or have headphones on watching a movie. I really couldn't care less what the guy next to me is doing.