Why? Because steam doesn't have sandbox for setinfo ? You mean it could be possible slowhacked by other servers or what did you mean?
Btw, the "sex" key was a joke.
But anyway it could be an idea to set setinfo sex "m" as default, because there are obviously more males in the game and if a girl wanted to "mark" herself as female then she will just write setinfo sex "f". Pretty simple but anyway it's not automatic. Girls have to write something in console.
Weird how no feminist has yet requested this gender thingy to Valve