Maybe you are a "voyeur".
Maybe you need some pictures for your school work.
Of course you can go to a dedicated website where you can find lots of free pictures. But you can also dig some private pictures directories.
Try this little code in Google and you may find a lots of Non public pictures
intitle:index.of +"Indexed by Apache::Gallery"
You can also narrow your search by adding a small word at the end of your syntax code
intitle:index.of +"Indexed by Apache::Gallery" +paris