Let's do a little search on Google Images and see what subject people take a picture of the very first thing they unbox that brand-new digital camera. All you need to do is search DSC00001, and most of the results will be the first picture taken. (NSFW)
Sure, DSC00001.jpg is not necessarily the first picture; you can reset some digi-cams so they start numbering at the beginning again, but for the most part, most people don't bother to do that. So take a look at this Google search, and you'll notice there is a certain over-representation here. Better be careful, the results may not be safe for work. Well, unless you have Safe Search on. [BlogStorm]
DISCUSSION
Only the first page of GIS is nsfw, the rest is pretty boring. It is already a fact that people like porn.