I talked to the the NextStage Evolution analysis folks a few years ago, and they have developed some new methods that deal with gender orientation, see here for some details. This is also discussed in their Linkedin Group. I would appreciate further thoughts about their methods in practice.
" ... NextStage Gender Persuader Tool (NSGP) analyzes on and offline material and reports whether the material favors a male or female audience. NSGP is based on NextStage's patented technology, been in use as a desktop tool since 2003 and in 2009 was independently evaluated at 98%+ accuracy. Bet you wish your current tool could boast that, huh? NextStage: Results. Nothing Else. Nothing Less ... "