 Unless it embraces primitivism, normative conceptualism still needs to explain what it is about the normative concepts in virtue of which they are normative. But this is a challenge it shares with all other forms of ethical naturalism and ethical non-naturalism, and perhaps also with all forms of ethical anti-realism. Further, it is open to naturalist normative conceptualism to embrace primitivism and agree with non-naturalists that the normative concepts are not analyzable in non-normative terms. For this thesis is not problematic to naturalism. Naturalism is primarily a metaphysical thesis about what there is. It is not a thesis about the analysis of our concepts or ways of thinking.