I'm afraid I've passworded some of my photos not because there is anything particularly offensive about any of them but my parents pointed out that the rest of the world probably doesn't care about my photos and seeing who my friends are.
Also they raised the some what valid point that anyone that googles for me can find them and see all sorts of reprobates I go to parties with doing odd things. Plus if you've ever had my parents whinge at you then you'll know that it's easier just to give in than it is to reason with them.
I used to have a CGI here that would let you fill out a username and password so I could add you but it keeps being spammed. I don't add photos here any more anyway. Try my flickr account instead.