Another way to think of it: Miley Cyrus is actually more covered than many of the characters in the Sistine Chapel.
See: http://www.nbcnews.com/nightly-news/will-michelangelos-david...
At the very least, they don't do any close ups.
Re: What would fit on American television today.
Pretty specious argument. Just because something was appropriate in the 1400s, doesn't mean we have to find it appropriate today. We also don't find hanging people in public squares appropriate anymore, or a million other things...
There are arguments to be made in favor of allowing more nudity on television. "They used to do it back in the day" is not one of the good ones.
That means current church dogma is just temporary ... it has no 'absolute validity' in it, which is even worse than allowing the nude pics. Or current theology is just creative thinking that happened in-between then and now. Why should a religious man submit to recent theology instead of the original Christian theology of 2000 years ago?
[0] http://en.wikipedia.org/wiki/The_Last_Judgment_(Michelangelo...