I should find the ruling and link it up but this is an interesting concept coming out of the ruling requiring part release of information held by Google:

The Justice Department had wanted access to search records to help prevent access to online pornography. The judge said privacy considerations led him to deny part of the department's request. "This concern, combined with the prevalence of internet searches for sexually explicit material, gives this court pause as to whether the search queries themselves may constitute potentially sensitive information," he said in his ruling...

..."The expectation of privacy by some Google users may not be reasonable," Judge Ware wrote, "but may nonetheless have an appreciable impact on the way in which Google is perceived, and consequently the frequency with which users use Google."

If engaging with your perception of privacy is a choice free people make related to their autonomous dignity inherent and not sourced from the state...are you your choices in porn? Nothing yet on the Google or the US Dept. of Justice sites. Another decently detailed report is here.