From The Atlantic :
PROBLEM: Women's bare bodies are on display in billboards, movie posters, and many other kinds of ads. Though plenty of studies have looked at the ramifications of this pervasive sexual objectification, it's unclear if we see near-naked people as human beings or if we really do view them as mere objects.
METHODOLOGY: Researchers led by Philippe Bernard presented participants pictures of men and women in sexualized poses, wearing a swimsuit or underwear, one by one on a computer screen. Since pictures of people present a recognition problem when they're turned upside down, but images of objects don't have that problem, some of the photos were presented right side up and others upside down. After each picture, there was a second of black screen before each participant was shown two images and was asked to choose the one that matched the one he or she had just seen.