I don't know how it is possible, but I get 20% of my hits from Google Images. How does that work? I post maybe two images a month, and have never posted any meta text that Google would recognize.
But, in an effort to increase my page rank, I'm going to post an image about what everyone searches for. Smooth, curvy, naked, and just a little dirty:
I suppose, since I didn't draw this, I should reassure you that yes, I have rights to the photo.