Gender Genie
There's a tool called gender genie. You copy a swath of text, insert it into the genie, and it tells you the gender of the writer. It has key words it defines as female or male, and bases the gender on the number of times you use these words. I've used it before and been greatly annoyed that most of the time it gets me right, whether I'm writing fiction or a blog entry.
I get annoyed because I don't like the idea of being defined as a "male" or "female" writer, especially not on the basis of preposition use.
But then I had the brilliant idea of using the genie for a new purpose: to 'discover' the gender of Hilary Tamar. Hilary features in Sarah Caudwell's mysteries and throughout the series his/her gender is never revealed. I always admired the trick. Caudwell did a damned fine job of never tripping up. So I inserted a lengthy passage from The Sibyl In Her Grave, a scene narrated by HilaryTamar, and the verdict was: writer male!
Of course, technically, Sarah was the writer, but she died in 2000 without revealing her the secret of Hilary's gender, so this is the best I can do.
Now go ahead and play with it.
P.S. If you like espitolary novels or old school British mysteries I recommend Caudwell's Thus Was Adonis Murdered. Plus the cover art is done by Edward Gorey, and who doesn't love some Gorey?