@Ian2: Ok, so you are worried that a minor may learn or see explicit words, then maybe don't sign in with your adult Live ID so that explicit content isn't displayed and denied access to.
For the others who are offended, please tell that to the artist of the content. I am pretty sure the Zune team would like (and should) to represent the artist's titling intentions when delivering their contents. I for one want them to do that and I'd wish censorship to die, entirely. I would respect your choice of words, even if I don't feel quite comfortable listening to those words you chose.
If anything should change, then it should only be a setting, like in DVD playback software, which determines which types of content to deny access to as an option for the user.