That's pretty fucking hot. I've seen it done in a few films, but never have attempted it yet. I have been fucked by multiple people while being watched at seedy bars and saunas, just never through a gloryhole...yet.
I'm usually slightly picky when it comes to my top, if I have to interact with them (like at my home, their home, hotel, etc) if its one on one. When I'm at the baths/sauna, everyone is usually fair game until they do something that annoys the fuck out of me, like hogging the line without fucking or while sucking me off, sucking with my toes, etc. Stand aside if you want to do that. I'm here to get fucked!