I went throught 20 files from my computer. (Most of them are stories on this site.) All were fiction. 90% of the stories were identified as male. So I guess I'm a guy most of the time. Some of the scores were close for example, 2354 female and 2453 male. That was only a 4% difference. Another close one was 1742 Female and 1419 Male. (19%) Most, however, were quite significant ie a difference of at least 50%.
The two stories that came back as female both centered around female characters. Considering some of the feminine words are her, she, and hers that makes some sense. They only count 33 gender biased words, after all. I think the test may tell us more about the characters in the story than the authors.
The other thing I noticed is that "said" is a male word. Does that mean that men write more dialogue?