Nope. If I'm told not to download something onto a computer (which is the case for the computers in the labs here), I won't...not even things like AIM for chatting to my friends (I use AIM Express for that very purpose on a school computer...it's a bit inconvenient, but hey, at least I'm not downloading anything). And actually, I can't even download certain things on the university connection, even on my own computer, since they're blocked somehow.
Speaking of porn...at the last college I went to, before they got new computers in their lab, it looked like someone was successful at looking at porn in there...because oi, one computer was full of really suspicious-looking links in IE and on the desktop...