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It’s a test to determine your gender, you just walk into whichever one you’re naturally compelled to and then when you get out you find out your gender. If you don’t want to go into either then you’re either nonbinary or agender
What if one is taken but you really need to go?
Guess I’m whatever three circles is!
That’s what the sink you can see outside the door is for
So this is basically the equivalent of the sorting hat from Harry Potter.
Is this the ritual I heard in old sagas called “Gender Reveal”