I am not a Playboy affiliate so can't see inside their webmaster area at how they are doing their feeds - and nothing in their standard pages on the
www.playboywebmasters.com site mentioned RSS feeds (I only had a quick look though). I would suggest you contact them and ask them - Playboy's affiliate managers' ICQ details are listed on their contact page. To be honest, for a company like Playboy it would really surprise me if there feeds didn't morph - but just hit up Rene or Brett on ICQ and they will be able to tell you.