If only we'd known back in 2001 that we were living in the bad old days when governments were irresponsible! At the time, we thought the new, shiny future had arrived!
Of course, we don't need to worry about this today, because the new, shiny future has arrived.
Well if you are gender fluid then select what you identify as at the moment of filling the spreadsheet.
Or better yet select what your employer sees you as, if you are a 6'3" male with a neckbeared your employer thinks you are a man regardless if you identify yourself as male, female, neither or a walrus.
