This type of gallery is a time-saver used by lots of adult webmasters. A paysite operator will utilize their own script/app or they’ll lease the service from a content provider. An affiliate webmaster would employ sponsor-provided auto-rotators for content on a free site. The auto-rotating gallery pre-loads and changes thumbs/images as often as instructed by the creator/webmaster. Website content looks fresher. Pages appear to be regularly updated. These little wonders are not a panacea for laziness. Also, they’re totally inappropriate for submission to TGPs.