the hidden costs of a world with a tenth of the men

A satirical book about exterminating 90% of all men for a better world got some traction again. What would happen if we took it seriously and followed through?

woman on bench

Once in a while, the internet remembers random things, such as a woman who wanted to trim the male population by at least 90% and use the survivors as breeding stock to reduce gender inequality across the world. While MRAs believe that this is what all feminists secretly want and most people understand that this is little more than a joke that went too far and has absolutely zero chance of happening, ever, all of the online discussions on the subject have focused on a trip down the histrionics-laden minefield of gender politics instead of a relevant scientific issue that should be front and center. Sure, being one of the few males left on Earth and given a life filled with relative luxury and constant sex sounds like the plot of a particularly wishful porn film which I’m sure has been made a few hundred times by now. But would it actually work? What’s the consequence of eliminating up to 99% of men from the gene pool? Well, it could very likely doom our species in the long run, even with heavy reliance on artificial insemination and gene therapy. We thrive thanks to variety, and reducing our genetic diversity will only harm us.

Let’s say that 90% of men are somehow culled. With about 10 women for every remaining man we’d quickly end up with the same problem as Iceland worldwide. In just a few generations, the attractive stranger with whom you’re flirting is likely your half-sibling. Sure, you can curate who gets to reproduce and how, but the sheer lack of new male genes will quickly have you trying to fight math. Artificial insemination using same sex donors is possible and has been done, but it’s still a very touchy, expensive process that doesn’t always work. Women in poverty or in remote, undeveloped parts of the world are going to have extremely limited access to this resource and women in wealthy nations will be looking at high costs and failure rates. Nature got really, really good at this whole reproduction thing over 3.5 billion years and re-inventing the wheel is not an easy feat. Today, the best we can do with tried and true technology is successful about 15% of the time per implanted zygote on average. After just ten generations, there’s going to be a very serious threat of a genetic bottleneck which spells evolutionary doom for any organism.

An even more base, but still relevant question in the face of us no longer being able to just out-breed our way through genetic defects and weaknesses as we do today, is what about women who want monogamous, long-term heterosexual relationships? That’s close to 90% of those on the planet in this post-male apocalypse world. Instead of having a boyfriend or a husband they just plain want, they’re now on waiting lists among rationed men who also can’t have any sort of meaningful relationship. While more women than men admit to same-sex fantasies, and acting on them, you might end up with artificially high same-sex pairings among women simply out of emotional and physical necessity. It’s one thing if you’re homosexual and have your choice of a partner everywhere you look. But if you’re not, your choices are to get on a waiting list for some person to whose gender you have a strong innate attraction, pair up with a same sex partner to release some stress until you can’t do it anymore, or be lonely. Again, there are good reasons why nature prefers a 50/50 ratio between the sexes, one of which is more choices in mating.

For better or worse, the survival of humanity depends on having plenty of men available, and a significant amount of genetic diversity. Look at every successful species in history. They thrived in enormous numbers because they reproduced efficiently and had many mates available on a moment’s notice. Small, inbred populations nearly always die out because they lack the genetic diversity and numbers to absorb a change in diet, or the environment, or new diseases to come out on the other end as strong as ever. Humans survived a supervolcanic eruption which left an uncomfortably small population that might have dropped to as few as 10,000 individuals, awful plagues, and an ice age. Had we become too dependent on over-structured breeding systems, or had our species grown far too sex-lopsided, we would’ve went extinct. So an idea involving a reduction of up to 99% of one sex shouldn’t just be met with political and social objections, but it should be first dismissed from the most important point of all: that of evolutionary biology.

# sex // biology / evolution / population

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