Oh, for Christ's sake!
Gee, it's fun to be "other." "Othering" is always good times. I wish I could be "other" every single day of my life! Oh, wait ...
Look: I don't want a third option. Given two options, I'll check "F." But I'd really rather not check any damned boxes at all. Why does my gender have to be so important? Why not ask me what my hair color is instead? Or would I have to check "other" on that account as well, since I'm neither platinum blonde nor black-haired?