Originally Posted by
Hitman
If we were brought up in a society where incest was normal, then people would be saying "why is is disgusting? :S" etc. instead of the opposite. I guess it is just perceived as wrong by nearly all of society and thus it is 'disgusting' - do you see what I mean? It is similar to gay sex in a way, for hundreds of years it's perceived as immoral, disgusting and shameful, but over time people have accepted it and now it's normal.
It's just like rape could be normal if society saw it as normal, and nobody would question it, but we don't see it as normal.
Kinda tired and my explanation may be a bit crap... I'm not saying I agree with incest, I'm showing that over time it has been seen as disgusting and thus is taboo and not allowed. I reckon the first humans would've probably have had sex with their close family... think about it.