Any party that occurs after some sort of population-reducing apocalypse including, but not limited to, 2nd Ice Age, Zombie apocalypse, Nuclear war, or Donald Trump being elected President of the USA.
In this post-apocalyptic world any gathering of people, such as at a party, will be required to engage in coitus so as to re-populate the world, the only people being exempted are those who are already pregnant.
Allie: The apocalypse has left me with so little to wear to the party tonight!
Melissa: That's alright, it's going to be a mandatory sex party anyway!
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