Here's a disanalogy between moral intuition and linguistic intuition (for example, intuitions about what a word means or whether a particular construction is grammatical). I'm sure that something like this is true, though I may not be talking about it right. And who knows, maybe it's more controversial than I think...
We can imagine a community where everybody across all times has the same moral intuitions, and they're all wrong. But we can't imagine a community where everybody across all times has the same linguistic intuitions, and they're all wrong. If the community of Spanish speakers regards it as intuitive that 'arroz' means 'rice' in Spanish, that's what 'arroz' means in Spanish. When we imagine them all using it to mean 'beef', we're just imagining a situation in which 'arroz' means beef in Spanish. However, if all Spanish speakers (or all Puritans, if we want to make this be a community of moral co-believers rather than a linguistic community) thought it was wrong to use birth control, there still might be nothing wrong with using birth control. This is because the linguistic intuitions of the community play a role in constituting the language, while the moral intuitions of the community do not constitute morality.
I'm just using intuition in the sense of 'pretheoretical judgment' here. Obviously if you say it's a presentation of necessary truth to your nous or something that'll mess up the example.
Better story, harder philosophy
3 hours ago