In science, there's a thought experiment called Schrödinger's Cat, where a cat is in a box with a setup of deadly poison that's 50% likely to be leaked. Without being able to test the box, you don't know if the cat is alive or dead. Although the cat can only be alive or dead, the odds are that the cat is 50% alive.
Since there's a 50% chance that there's a man on the other side of the glory-holing wall (probably really 95% that there's a gay guy, but let's say 50%), you now have a 50% chance of being gay. Does that change your enjoyment of the experience? Maybe Eddie Murphy could help elaborate.
Guy 2: Go talk to her!
Guy 1: Maybe, looks like i have a Schrödinger's Pussy on my hands. I'll be back in 10 mins.