Nakedness is just the state of being unclothed. Nudity is what happens when you PLAN to be unclothed. Most people are naked, not nude, when they shower, for example. But artist’s models pose in the nude, not the naked.
You say that like it’s a bad thing.
Moderator comment: Pimms: You’re fairly new here, so I’d like to suggest (strongly!) that you read the FAQ - Rules for Posting on the Straight Dope Message Board, especially noting Post #10: Are there any Rules about insulting other posters?
You might also want to check the Forum Rules for Cafe Society forum.
In short: personal insults are not permitted in this forum. It is possible to have a discussion of a topic (even nudity) without drawing conclusions about the personality of the other posters. Please play nice.