I’ve long practiced this, glad to finally get a third party to verify that I’m not alone. When you go to a movie with a guy friend, if there are many empty seats the two of you leave a space in the middle. I always called that the "gay buffer." Oddly enough, students in Light Force have extended that to just about any social situation… but let me be clear, the gay buffer is only for movie theaters and similar situations. Sitting next to another guy in a full van is no big deal.
This appeared as the urban dictionary word of the day:
I’m not gay seat:
The empty seat in a movie theater that two males leave between them to show the rest of the audience that they are straight.
Bob: I went to a movie with John the other day but we left the I’m not gay seat, so no one thought it was weird.
So, there you have it.