I have a bottle of Dubrano's castoreum tincture.
I would agree with 'sawdusty/hairy', a little dirty and dry & I suppose I can see the analogy of 'very masculine'
I would not call it thick or greasy though. The ultimate drydown - for me anyway - is probably best described as leathery.
I have tried Creed's RSL and Cruel Intentions but did not make the castoreum connection in those two.
Time to revisit it seems.