There would actually be a lot more negatives than positives in a nude society; once you get past the fact that you can see hot chicks nude, you realize there are much more ugly than attractive people in most places. Once you account old people, awkward boners becoming more than just awkward, and the frightening reality of how convenient it would be for pedophiles and rapists, the prospect of a completely naked civilization doesn't seem so awesome after all, amirite?