Rachel McAdams talks about nudity (and Eric Bana) with Parade Magazine:

"When you're playing a fictional character, it's as normal and mundane as eating breakfast. What bothers me is our culture's obsession with nudity. It shouldn't be a big deal, but it is. I think this overemphasis with nudity makes actors nervous. There's the worry about seeing one's body dissected, misrepresented, played and replayed on the Internet."

I'm presuming she knows all about the "dissected, misrepresented, played and replayed on the Internet" part, as the hairy nipple in the picture below (slightly NSFW) from a December 2005 movie premiere was indeed studied closely on the Internet.

The popular verdict at the time was that a little tweezing would have helped...