How would modern society react if Mate Or Die was in effect for humans and mating also gave unaging?
It's this question, but starts at the modern age, instead of the stone age.
'Mate' is defined as penile-vaginal sex with ejaculation.
Requirement starts at puberty. People know when it starts, how long they've got, the general info that this death-clock resets by sex, and they are also killed, via magic.
Death by Mate or Die causes the conversion of all nervous system electricity into photons, causing a white flash around the body.
The Mate Or Die condition cannot be circumvented by science. Inter-sexuality does exist. The mating condition is not reworked to prevent that from being an automatic death sentence. And male/female-ness for the mating condition is gonadally determined.
Each mating gets each partner 30 days of life. Unless it's a woman, whose pregnancy keeps her alive for the whole pregnancy, and 30 days after birth.
Mating with condoms or any other kind of physical contraceptive, grants 1/2 the time to live of the previous mating. Like a 30-day girl and 30-day guy mate, and then they both have 15 days to live, keep doing it, and they could get to a point where they can't mate fast enough to prevent death.
Effects of males mating with pregnant females is the same as contraception-mating.
The Pill and other chemicals that cause the woman's body to hormonally mimic pregnancy also cause the death clock to change as if the woman is pregnant.
However, other non-physical, non-immediate contraceptives, like the rhythm method, or douching, don't shrink the 30-day death clock.
But, Inter-Uterine Implants or any kind of Surgery, do shrink the death clock.
Note that if a male gets a girl pregnant from mating, they still get 30 days from that mating, but if they mate with her again, on their 16th day, then they just get one extra day of life. So, it's best to space it out farther apart... And there's some math like... 30+15+7.5+~4 +~2 + ~1 = ~59 ... If you time it so they cut it really close, they get a little bit less than ~2 months before they have to switch to a non-pregnant girl.
That's also how it works with normal sex. If you have non-pregnant sex on consecutive days, you keep adding only 1 day to your death clocks. as 30 days from day of last sex is 1 day before the last time. The death clock counts from day of last mating, and resets at each mating.
Also, women don't run out of eggs. Unless they already did.
People can die by injury and illness, but not of old age. Immortality begins at 20, but the 'immortals' are still subject to Mate Or Die. Also, the mating does not reverse age until they hit 20. Menopausal women have their menopause stop after their first new mating.
Infertile people function basically as normal in the universe, as long as males can still ejaculate, and women still have a vagina, so certain injuries will kill by proxy.
If you're on life support, you still need sex, or you'll die.
Everyone that's subject to Mate Or Die gets 30 days on their death clock when this is implemented.
Humanity is defined as the homo sapiens species. 'Human' is anything that can have offspring with us.