+1 for DeviantArt. Many artists and models already use it, the community is generally tolerant of unconventional modes of expression, and the platform is designed to be able to handle "explicit" (by U.S. standards) content in a fairly straightforward way.

I started using tumblr for a photoblog several years ago for the simple fact that it wasn't blocked by the Great Firewall of China. All the FB properties, and most other western platforms, were / are blocked. It meant I could post and view while on either side.

Perhaps Verizon is gearing up to market it there?