There are two major changes done by Microsoft in the Bing search engine: Smart Motion Preview and Safe Search. It will help institutions to filter out porn.

First, potentially explicit images and video content will now be coming from a separate single domain, explicit.bing.net. This is invisible to the end customer, but allows for filtering of that content by domain which makes it much easier for customers at all levels to block this content regardless of what the SafeSearch settings might be. This makes it much easier for filtering software to block unwanted content if SafeSearch has been turned off.

In addition, we will begin returning source url information in the query string for images and video content so that companies who already use this method of filtering will be able to catch explicit content on Bing along with everything else they are already blocking for their customers.

With this change, the offices and institutions can directly block the domain from which explicit images are being served, so that users will not be able to view porn content irrespective of whether safe search is on or off.

The video and images will not be displayed for any URL which is blocked.

You can download the Bing Complete User Guide.