People striped of their clothes no longer have the symbols of power, wealth, style or lack there of that defines who they are and the times they live in. Are they fashionable? Are they conservative? Are they trying to impress?
When all of this is striped away, what is left is the pure form. The nude portrait is not so much a portrait of the individual, but rather they become archetypes for the lover, the warrior, the virgin or the temptress.