I'm with Autumn. I am respectful of Maca and GG's emotional needs regarding pda when they are both around.
But-beyond that, I hug, kiss and hold hands with either when we're in public. It's my relationship and I'm proud of the relationship (whichever one is being displayed in the moment) and I don't pretend otherwise.
Where I socialize, that comes into play a little bit. I don't go visit them at work with the other on my arm-because I'm not going to play down my relationship to keep their co-workers in the dark. It's mostly arbitrary now though. Maca's big big boss (owner of hte company) is fully aware of our dynamic and GG is open with his co-workers as well. But, that's fairly new (as in the last couple months).