Denise explains here.
If you dislike this idea as much as I do (or if you dislike the barrage of gross diet ads you get on Facebook when you set your gender to "female") then perhaps you'd be interested in offering LJ some feedback.
ETA: as it turns out, this code made it to beta and isn't going live, for (what sounds like) this and other reasons.
One of the reasons some people give for the fact that there are fewer women than men involved in many areas of technology, engineering, and "hard" sciences is that, you know, women and girls aren't very interested in that "tech stuff"; they just don't like it as much as men and boys.
If you would have been with us on our trip to Science North this past weekend, you would have seen that argument for the great load of bullshit that it is. Not only did our girls have a great time, there was pretty close to an even gender split amongst the other kids in attendance, and I sure didn't see anyone off in the corner sulking about how "boring" or "uninteresting" the place was.