Huh? Since when?
This does a pretty good job speaking of papal etiquette:
http://www.npr.org/templates/story/story.php?storyId=89667043
My uncle is a most high reverend in the Episcopal church.
Decades ago he was granted an audience with JP2.
He kissed his ring. He should have known better.
When I asked if that was appropriate since he is not an RC, his response was “But it’s the Pope man! The Pope!” as if star power trumped all.