Here's one difference between men and women:
A recent article in the Online Journalism Review measured where men and women's eyes linger when they see a picture. Women look first and longest at the face, while men look at both the face and the "private anatomy."
"[Researcher] Coyne adds that this difference doesn’t just occur with images of people. Men tend to fixate more on areas of private anatomy on animals as well, as evidenced when users were directed to browse the American Kennel Club site."
I always knew that you men were dirty, dirty creatures...but dogs????!!!!!