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by ninkendo 2911 days ago
I'm about as far from someone who understands this topic as it gets, but here's my explanation for why rape is bad that doesn't invoke god:

It's not an evolutionarily stable strategy. [1]

By that I mean, if we had a society where rape was normal, and sex was largely a nonconsensual thing, meaning there would be more violence, women would develop adaptations to prevent being raped, and more energy would be spent on the prevention of unwanted procreation, and the the gene pool would be less fit for survival than one without the rape gene.

But merely having a society full of non-rapists isn't enough either: the first serial rapist to come along would invade the gene pool by raping others and spreading the gene that encodes this "rape others" behavior, and within so many generations the gene pool would be full of rapists.

To have an ESS, our behavior would have to be encoded with a "don't rape others, but also don't tolerate others who do rape" strategy, which would increase a society's fitness for survival, and be more resilient against an invading strategy.

Calling rape "immoral" is a good shorthand because "morals" are basically a formal way of defining the whole "don't do this, and don't tolerate others who do" concept in a way that humans can understand. But at the end of the day morals are just an abstraction that we've had to create in order to be more successful as a social species. Religion may have helped as well... to me these things are extended phenotypes for our genes that have been selected for over eons to keep our gene pool at a stable equilibrium.

[1] https://en.wikipedia.org/wiki/Evolutionarily_stable_strategy...

2 comments

Rape is a regular thing for ducks to the point where males and females have evolved weird reproductive organs in some sort of evolutionary arms race. Bed bugs practice what is known as 'traumatic insemination', where the male literally stabs a female with his penis, and sperm travels to the eggs through the blood of the female. Females can die of infection because of the open wound left after sex. Clearly rape isn't such a big evolutionary disadvantage that no species exist with this trait. Likewise, lions show us that killing or scaring away someones partner and killing their infant children can be perfectly 'evolutionary stable'. It seems to me that your reasoning starts with the conclusion, and then works backwards to some argument that sounds plausible. It's a strange world out there, and I would be very wary to base morality on evolution.
> clearly rape isn't such a big evolutionary disadvantage that no species exist with this trait.

If different species (with different evolutionary strategies) also have different moralities, would this not be a strong hint towards morality being based on evolution?

> spreading the gene that encodes this "rape others" behavior... within so many generations the gene pool would be full of rapists.

Not neccesarily. In a small society, a serial rapist would be hunted and killed quickly or forced to run away. In both cases, his children would struggle to survive without the food and protection provided by a father. Many of they would starve and not survive to reach the adulthood.

That's the point I meant by saying it's not a stable strategy to just not rape, you have to have a "punish those who do rape" trait encoded as well. Or more generally, moral standards.