Full Idea
Lewis proposed that all perfectly natural properties are intrinsic.
Gist of Idea
All perfectly natural properties are intrinsic
Source
report of David Lewis (New work for a theory of universals [1983], p.355-7) by David Lewis - Defining 'Intrinsic' (with Rae Langton) IX
Book Reference
Lewis,David: 'Papers in Metaphysics and Epistemology' [CUP 1999], p.130
A Reaction
Depends what you mean by 'natural', 'property' and 'intrinsic'! Presumably there are natural extrinsic facts, in naturally necessary relationships. If all natural properties are powers, they would have to be intrinsic. Extrinsics would be derivative.