Risky Search Shows only results that other search engines remove from their safe searches.
You can turn off safe search on Yahoo or Google, but you still get the safe results mixed in with the “Risky” results. Risky Search shows only the content that other search engines filter out of their safe search results.
One thing you will notice is how arbitrary “Safe Search” is. Who knows why search engines choose to leave out some of these results. Give it a try for yourself!