I saw that hub ... some of the images included with your hub may have triggered auto porn detection. There are Bayesian filters that are used for images ... or it may have been a manual process...
I'd be willing to bet if your pictures had less flesh, it would get republished.
Another hubber had his religious hub censored for "hate speech" and from what I can tell it was pretty tame.
Welcome to the Land of the Free and the Home of the Brave.