How does it work? The site says...
Inspired by an article in The New York Times Magazine, the Gender Genie uses a simplified version of an algorithm developed by Moshe Koppel, Bar-Ilan University in Israel, and Shlomo Argamon, Illinois Institute of Technology, to predict the gender of an author.I tried it with a short entry that was judged far more feminine than masculine. Then I read that it works best on text with 500 or more words, so I plunked in a larger text and that was much more masculine than feminine. Dejá vu! Way back in college, the professional inventories I took listed me as scoring similarly as male teachers who liked their jobs, but not female teachers who did. Whatever.
Give it a try. Let us know how it did with your writing.