Whatever Happened to Common Sense?

This article brings up a seemingly complicated issue (as stated in the article). Should the internet be filtered in pubilc libraries. The author suggests that it is simply common sense to filter the internet. I wonder though, how much restriction would be placed. Would it become impossible to gain access to important websites such as those on sexually transmitted diseases for a research paper for health class. I think this issue can be solved by librarian monitoring, and not standing over the shoulder of a student on a computer but simply filing through the area. Most students if they catch an adult milling past them, will not be thinking of finding pornography and if are afforded the opportunity to (if it is a link in a websearch) are unlikely to follow that link due to fear of being caugt. Just a thought really.