this has been discussed many times (even here), and I bring it up again just because I've recently seen two examples (proving that it's an ongoing dichotomy, I guess):

"Guy stands up buck naked and takes a little bow."
- Michael Connelly, Trunk Music (1998)

"Armstrong is pushing himself so hard on this Tour that if you want to see him, you have to see all of him, butt naked, on the massage table."
- Rick Reilly, ESPN July 9, 2009