(I really hate not being able to edit posts.)
I guess it depends on your definition of "sensitive". I believe that the first two definitions, listed on dictionary.com for the word, cover the two different things we are thinking about
:
Quote:
1. Capable of perceiving with a sense or senses.
2. Responsive to external conditions or stimulation.
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Less nerve endings would result in less capability to percieve sensation, while calloused skin would be less responsive to external stimuli.