Specifically, is there a way to get the reader used to a world where say, cannibalism is a lot more common? Or are there certain behaviors where it's just not possible for the reader to accept them? I bring this up because worlds with radically different morality in regards to certain behaviors, with cannibalism being an example I'm thinking of trying. In that case, it'd be part of war, with soldiers taking bites out of opponents and eating them after battle, and the dead, with those who die in peace time being eaten by their family. Now, I think the last may actually already be a current real world practice, and I know the first occurred some in the past. However, it's rather out of the mainstream, and cannibalism is one of the highest cultural taboos imaginable, hence, I wonder if there are any tips to getting a reader to accept something like that in a setting?