When Bing first launched, it received a lot of hype around the amount of porn it found. Soon after, Microsoft added additional measures to help filter out the porn and adult content.
Now, it seems like Google has changes Google Image Search to make it just a bit faster and easier to find adult or pornographic content with the search engine. If you conduct a search, you will now notice the "SafeSearch" filter has a quick drop down box that allows you to make the filter stronger or turn it off:
In two quick clicks, you have access to any type of picture you want.
Forum discussion at WebmasterWorld.