It is a way to see where people's boundaries lie from an anthropological standpoint. As time passes, it seems like our tolerance for racy keeps pushing forward.
The following cluster is a collection of things that people have classified as 'racy.'
Implications - You might find yourself blushing while clicking through these particular features and scrambling to turn off your screen when you hear somebody coming up behind you. As time goes on and society becomes more and more immune to these sights, you'll probably see more of their type popping up all over the media.