There are two additional filters available for you to reduce the number of unwanted porn hits in your searches: words and hosts. Likely, what you are getting is merely pornographic advertising for websites, not larger video files. Most of the "Famous Name" female singer porno is short files that open your browser automatically after a few seconds of tasteless hardcore (I downloaded one just to see). That means they have a static IP that you can filter out (which I have done). The same goes for the four letter words: just type them in, and all those porno files with strings of four-letter words will not appear.

This may not filter out everything, but it will go a long way.