Those with a higher sex drive are now immortals, and that means we’ve got, like, the top .01% of sex drive in the world. Them’s some horny mofos.

So, they’ll reproduce like crazy, and those children will have inherited their parents prodigious sex drive, and they, too, will reproduce like crazy. Homo sapiens mortalus has a 7 billion unit head start, but homo sapiens immortalus will catch up in a few dozen generations… and then, things only get worse.

Overpopulation. Homo sapiens mortalus begins to die off in droves as resource scarcity squeezes them off the globe. Ecosystems collapse to ruin. Wars and upheavals cripple the globe as humankind tries to turn against the rising immortal tide… but their guns are no more use against the immortals than a flashlight might be. If anything, the guns only show the futility of the conflict. Humans are vulnerable… the new mankind is not.

The last mortal man dies eventually, likely somewhere out in the desolate ruins of civilization, but the horny droves of immortals have only just begun to suffer. None of them die, so their population only continues to increase exponentially. They engage in massive starving orgies of frustration and rage at the failing world, but their sex drives are still 99.99% percentile of current human beings, so they don’t and won’t stop. More babies. More mouths. Less food. Less space. Less joy.

Soon, the writhing horny mass of immortals spills over from the packed land masses and into the oceans. Poor, sexual beings drift to the bottom of the ocean’s deepest trenches and have watery threesomes in davy jones’ locker. Everyone is starving. Everyone is drowning. Everyone is rutting, and there’s no stopping it. They’re burning in volcanoes. They’re struggling to breathe on mountaintops. They’re under rubble of ruined buildings and giving each other handjobs.

Soon, the writhing mass of humanity will begin to smother out the planet, covering every square inch of earth and ocean. The human tide rises, as immortals spend millions of years compressed beneath the sexual writhing of the immortals above. Eventually, after billions of years of suffering and reproducing, earth reaches critical mass, and it begins to collapse in on itself as it forms a main sequence star. It is composed entirely of sexy, unkillable gods, and they scream for all eternity as they burn under the massive compressing weight of the golden star.

That star is sol. It is our sun. This has all happened before. It will all happen again. Thank whatever deity it is that you believe in that you are not of the 0.01%. For their lot, and the lot of all those to come, is among the worst horrors that man, with our very limited minds, could ever imagine.