What gender do you write in?

http://www.bookblog.net/gender/genie.html

Interesting. I tried writing in what I thought was a light florid style about Spring flowers, etc., but it still came up as 97% Male. I then wrote a way-over-the-top paragraph about one soldier disembowling another in combat and that came up 160/59 chance of being female. I have yet to submit a story of a soldier violently disembowling a flower...