In the few words shared by the Google Image Safe Search team about decision-making around images, there’s an inference that the answers are obvious to smart, conscientious people.
By asking ourselves if an image could be considered inappropriate by a mom — any mom anywhere in the world — the answer is almost always that we will defer on the side of caution.
Imagine my surprise to read that the performance artist Paisley was featured sans clothes at the Chelsea Flower Show in England. By any Google Image criteria, the photo that follows the one of Queen Elizabeth is not suitable for moderate search. (You see a ni-ple, and my understanding is that this is foreboden in Google moderate search.)