Enmos
Valued Senior Member
If you look back at history, you will notice that many people attempting to keep power in their own hands interbred, and that there was no special taboo against it. In Roman Egypt most of the recorded marriages were brother/sister for several centuries up to the time of Cleopatra.
I suspect that an aversion to sexual desire for those one grew up with is common, but that "disgust" is cultural. Culture has a good reason to avoid incest, to keep the population as a whole healthy, but it's clear that the level of overt repulsion has varied from society to society. That said, it's too easy to sit back and declare the things I believe to be "universal" and biological, I may well be projecting my cultural bias.
I know, but I really think that has something to do with their perverted sense of superiority.