for discussion purposes, why is it REALLY taboo to have incestual relationships. the main argument would be its bad, genetically. but what if no babies were born from the relationship? The "ewww gross" part is a matter of general norm and bias really, like how we used to frown on gays and lesbianism, and now we're so selamba

well, not really. but only for the argument that u cant have a child due to genetic issues, in which case IMHO there's no point havent any sorta incestual relationships, since u cannot have an offspring, which is what drives us to find relationships in the first place.