On another site I visit, the software has "Gender" as a text box that you can fill in with anything. Some people write "Male." Some people write "Female." Some of the more creative responses are "Girl with boy like traits", "Biologically male, but 91% feminine", and "Whenever I see gender, I think of blender...am I a milkshake?" (And it isn't a transgender site...in theory.)
I wrote in "Questioning" for a while, then more recently replaced it with "Fluid androgyne."
And that's why I don't select one of two astrological icons.