I do not know much on how the Google Image SearchSearch filter works, I do know that many safe images get caught by the filter and Google has to make exceptions but I also know that it lets through some non-safe images on occasion.
So when I spotted this Google Webmaster Help thread that said an adult oriented web site can still have images included in the moderate or strict SafeSearch filter, I was intrigued.
Susan Moskwa from Google explained "the SafeSearch filter only cares about the content of the images, not of the website." Good to know.
Outside of that tidbit, I found the thread pretty interesting to read. The user is complaining that Google is being unethical by filtering out a "company that promotes adultery" images. But yet doesn't feel adultery is unethical?
The bottom line here is that Google is only filtering the images because some of the images are pornographic and if they remove the pornographic images, the images can be included again in the SafeSearch filter. But to argue ethics of Google about a site like that, just seemed ironic to me.
Forum discussion at Google Webmaster Help.
Image credit: Pascal on Flickr