[Thiez]

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.

[Riesling]

> 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?