As the title says, these aliens has silently been sucking out the feelings of eros/lust. which will make humankind extinct in a few hundreds of years.

These aliens are unquestionably very advanced, in fact, they can wipe out human life within an hour if so they wanted with both biological and technological weapons. They can even modify memories through light. But the aliens abhor violence, so they decided instead that they will let us go extinct. Not by war but by taking away the drive force of committing sexual acts or lust that will inevitably lead to reproduction. If there's no reproduction, then no human beings will be born.

These aliens can manipulate feelings to a very fine degree. But they can't control the human mind.

We don't know that these aliens exist. And they are, however, willing to accelerate our extinction through natural or biological means, but nothing to invasive like viruses or alien bacteria.

Practically they can incite wrath among the top echelons of the government and start a world war which will inevitably lead humans to develop technologies that will probably defeat the aliens or it will turn into a nuclear war which will turn the world uninhabitable that it will need a few hundreds of years and a lot of resources to re-terraform. So this is the best option possible to them.

If these can be fought by us, then the aliens will be willing to be brought to the negotiating table

  • $\begingroup$ Eventually governments will just be paying people to reproduce so this won't really work. $\endgroup$ – A. C. A. C. Jul 24 '17 at 17:20
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    $\begingroup$ I believe the desire to have kids is not exactly the same as lust. Not all children are accidents made out of sexual desire, and mothers can still be inseminated artificially ; this tactic will just slow down birthrate mostly in poor countries, and prevent unwanted children worldwide. I do not think this is a good plot element, as your aliens seem to lack imagination. There is a virtually infinite number of ways to exterminate a race without violence. $\endgroup$ – Spectantibus Jul 24 '17 at 17:28
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    $\begingroup$ @mico villena Humans can usually work past their primal urges for the betterment of society. But since you are making your aliens basically Godlike in power level compared to humans, they can do what ever they want. People also don't need to have sex to reproduce anyways, artificial insemination is perfectly valid way to produce humans. $\endgroup$ – A. C. A. C. Jul 24 '17 at 17:29
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    $\begingroup$ Wow, wow, now you are asking a completely different question - "How aliens can manipulate humanity so it will go extinct?" $\endgroup$ – Alexander Jul 24 '17 at 17:38
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    $\begingroup$ How is a forced contraceptive (say, a virus that destroys every human egg cell on the planet) less natural than a magical raygun that removes several of the most basic desires our species has? Also, I feel like you're basically asking "how can humanity defeat undefeatable aliens?", which obviously has no answer. Finally, how can they modify emotions and memories but "can't control the human mind"? $\endgroup$ – MichaelS Jul 25 '17 at 5:44


First, you're going to have to research how this emotional control works. Is it a beam that can be blocked or reversed? Is this something that can be overridden via pills, like a the various erectile dysfunction pills today? Are some people immune to the effects? If so, how? (and so on) They will need more data on the how before they can form a plan to block...


While research spools up, propaganda campaigns will be needed to encourage people to "Have one for the team" or "Keep Calm and Procreate On" or whatever. These ad campaigns probably will have, at best, minimal effort. But governments will try them anyway.

Power through

Some folks will take or be encouraged to take medicines to artificially induce physical arousal. It may result in pregnancies, even if neither participant is emotionally aroused. Some people do this already to get children (those with low libido, or who just aren't into sex). Scale that up.

Airborne sprays, something in the water, etc.

If a chemical additive can temporarily block the alien power, then that'll be used. Infuse it into the water supply, start mass inoculations, or spray it from crop dusters... whatever works, we'll take it.

Artificial insemination

For families that want children, artificial insemination may be the best way forward. No sex, but you still get children.

Doomed to Fail.

All of the above is doomed to fail. Once the aliens spot a group trying to "test-market" a possible solution, they can simply go in and wipe the memories of all involved. With the ability to modify both emotions and memories, anyone who attempts to publicly and actively solve this problem will suddenly get reset to less than zero. They will forget their potential solutions. They will be too angry or depressed to try to re-discover their solutions.

And any group that can organize around protecting the researchers and developers will find themselves too angry/depressed/etc. to remain impartial. Each such group will devolve into chaos, split apart, and then forget what they knew about solving the problem.

In the end, no group can win against these aliens. Only through complete secrecy is there any hope. But with secrecy, you lose the ability to scale up your solutions to a global scale. Pockets of people, if they can hide, might succeed. But at the global level, society will collapse under these mind-control aliens.


No, humanity will not go extinct.

As stated in the question, "alien ray" would block erotic feeling, but not the desire to procreate. And it's the latter, not former, that is responsible for most babies around, even in developing countries.

Also, "alien ray" (as currently stated) would not make opposite sexes revolting to each other - only the carnal part of the interaction would be affected. Which means that dating and falling in love would still going on as before. People would still be getting married, even if it would be a sexless marriage.

After that, they could either overcome their revulsion, or move to artificial insemination (which would not require any high tech).

So, the humanity would survive. The human culture, however, would change a lot.

  • $\begingroup$ Lets say the act of reproduction becomes repulsive together with abhorring the feeling of lust to multiply the effect? $\endgroup$ – mico villena Jul 24 '17 at 18:31
  • $\begingroup$ Then my answer would stay. "Platonic feelings" are not going anywhere. $\endgroup$ – Alexander Jul 24 '17 at 18:35
  • $\begingroup$ lets say lets take lust to the extreme of love then turn it into hate. not in hate of procreating but hate of child instead of love. Produce normal cases of infanticide to parents say 3 out of 10 for the next few generations of infanticide then 9 out 10 cases of mild to extreme child abuse. would that lead to the desired outcome? $\endgroup$ – mico villena Jul 24 '17 at 18:41
  • $\begingroup$ no feelings of lust amplified by mild to extreme cases of child abuse + 3 out of 10 ratings of infanticide will in what i think achieve the result of extinction $\endgroup$ – mico villena Jul 24 '17 at 18:43
  • $\begingroup$ "Hate of children" would work much better for your scenario. You don't even need much of infanticide - people would generally stop having children in the first place. $\endgroup$ – Alexander Jul 24 '17 at 18:46

Well, having been around ace and aromantic people for some time while I worked as counselor in a LGBTQ center I meet many people that didn't wanted sex, but wanted to have sons and daughters someday.

Since these aliens are godlike, then there is no way to really fight them, but if that's their only attack then humanity should just wait the aliens get bored and move on.

  • $\begingroup$ They are in it for millions of years if necessary. These alien race like to collect races as if a collection. SO that others wont take their collection they will pursue the extinction of the collection so that the few that they have will be the most priced ones of that collection. But as i said their method is assured extinction multiple hundreds of years we will be extinct still regardless $\endgroup$ – mico villena Jul 24 '17 at 18:31
  • $\begingroup$ So they will need to do more than just eliminate lust, if they are going to wait millions of years if necessary than there is no way to fight them. $\endgroup$ – Sasha Jul 24 '17 at 18:33
  • $\begingroup$ lust is just an amplfier or just another form of an emotion... if they make procreating artificial or natural otherwise be abhorring or outright wrath inciting which later produces child abuses to extreme and will be normal cases of infanticide. $\endgroup$ – mico villena Jul 24 '17 at 18:38

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