When usability expert Jacob Nielsen conducted an eyetracking experiment to improve the effectiveness of news article design, he discovered that men (but not women) stare at crotches!
Although both men and women look at the image of George Brett when directed to find out information about his sport and position, men tend to focus on private anatomy as well as the face. For the women, the face is the only place they viewed.
This image of George Brett was part of a larger page with his biographical information. All users tested looked the image, but there was a distinct difference in focus between men and women.
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.