In June 2013 the Australian Government issued guidelines about the best way to ask people about their gender.
Surveys and other forms requesting to identify gender should include the following options:
M (male), F (female) or X (Indeterminate/Intersex/Unspecified)
It would be great if these options were to be adopted in all new surveys/forms and slowly retrofitted in existing ones as well.
For more information and to downlaod the full guidelines document visit the Attorney-General's Department website.