My mother has informed me that I was born nude! Who'da thunk it?
FWIW I think Scott hit the nail on the head a while back. To take it further, my interest and response to a print will vary as much as individual responses among persons may vary, from print to print, and even depending on my mood, mindset, or any number of cues that may or may not evoke different reactions in others, because of who I am in particular, and my life experiences, and what time of day it is.
Taken as a whole, the elevated viewing numbers involving the nude simply says we are interested, but not much more. Past that information, I believe it's an individual thing.
As an aside, I've found it interesting that many comments on the subject have seemed to reveal more about the person making the comment than the subject at hand. Maybe that's a big part of it, we are more vested in type of thing, whatever the intention, because it reveals us as what we really are, sans trappings.