[The One and Only...]

Perhaps I should clarify. Human desires do not change, because desire is a evolutionary tool that makes us fulfill instinctual goals. Human nature, on the other hand, can be changed in so far that different people in different situations can draw different conclusions.

I presume that I am using your definition of human nature here. In actuality, I would say that human nature stays the same: the conclusions drawn are merely different because of adaptive reasoning.