This is the Yahoo version of the UnSafeSearch script, your search is done both with and without the family
filter, and only the results SafeSearch removes are returned. Have fun :-)
Search
Common uses for this script:
Discovering censorship: webmasters can search their own sites to see which pages aren't being shown to all search users.
Research: Knowing where search engine filters are strong and where they aren't is kinda interesting. (mostly they aren't)
Finding porn: Streamlining your adult queries so there's less irrelevant vanilla stuff.
Related to: Google UnSafeSearch, and to Ask.com, which uniquely has this behavior right out of the box (bless their cotton socks).