I'm interested in creating a (humorous, satirical) science-fiction short story wherein the protagonist repeatedly claims
if everyone was gay, the human race would die out.
Then (somehow) one day... wish granted! In particular:
- Everyone is now gay, except the protagonist.
- The human race is on the brink of extinction because they are convinced that gay people cannot reproduce (as per the protagonist's claim).
- The protagonist is now the only human who realizes gay people can still reproduce. To save the human race, the protagonist needs to convince people that, despite being gay, they can still reproduce.
I'm wondering how this could arise using quirky, not-very-strict science fiction: funny and curious is more important than realism.
Question: What could lead to everyone on Earth becoming gay, and the human race facing extinction because they believe they can't reproduce?
I'm thinking in the ballpark of e.g. (a) protagonist was cryogenically frozen, and was revived to save the species after everyone became gay, or (b) a nearby comet leeches alien pheromones onto Earth, inadvertently turning everyone gay. I'm after something that's not too simplistic, e.g. "wave a magic wand and everything turns out that way".