Pornography is so creative that I find it hard to have one algorithm that can detect it all. Looking for features certainly wouldn't catch the more weird stuff.

Pornography is so creative that I find it hard to have one algorithm that can detect it all. Looking for features certainly wouldn't catch the more weird stuff. Maybe a good approach is an image lookup, trying to find the image on the web and seeing if it appears on a porn site, or a pornographic context.