Fellow library student here, and I have to disagree with some parts of this. Pornography can be considered a valid form of information, and as such is a totally legitimate thing to look at on library computers. And if it's legit, then accommodations should be made for it. We're not in the business of telling grown adults what they can and can't look at on the Internet, and as we're a major source of Internet access for a surprisingly large part of the population, we can't forbid them from doing this outright.

Now, obviously, if their viewing materials are making other patrons -- especially families with kids -- uncomfortable, then that needs to be stopped in the interests of keeping the library freely accessible to everyone. But I think it's important that we recognize that the guy watching porn has a right to watch porn if he wants to, and that that's not something that we as librarians have any role in curtailing or preventing.

This is why so many libraries provide privacy screens (among other reasons -- there are a lot of things that people using computers might not want their immediate neighbors to see), or why they direct patrons who want to watch porn to certain stations, or why they provide separate kid-friendly computers.

But no public library should EVER be in the filtering/forbidding business. It's not "unfortunate" that people watch porn in the library; we might not like it, but it's still a totally valid use, and if a librarian is too squeamish to stand up for that fundamental right, then they shouldn't be a librarian.