Angry. I used the word "female". HTH.
Barracker absolutely, I'm actually not making a comparison between age and sex though - not at all - because as you say they have some crucial differences.
What I'm saying is that we already have in law, in society and in our understanding things which do not have "one true meaning". So things whose meaning is guided by the context. I'm using "adult" as an example of that - something whose meaning is defined by the context.
flowers you said about self-ID'ing as an adult to vote. You're quite right, you couldn't self-id to vote because as we both know the context of voting is a legal one, thus so is the definition.
...but you can eat off the adults' menu in a restaurant by self-identifying as an adult, because the meaning of "adult" in that context doesn't require you being over 18, or sexually mature, or mature in any way - it simply requires you to have an adult appetite!
So if you want to make the parallel with gender (although it's obviously imperfect), sometimes it's entirely inappropriate to self-ID as a man - for example for male cancer screening. In other contexts where biology is unimportant it might be perfectly appropriate, so if i ask a shop assistant where I can find clothes, oh but I'm not a woman I'm a man, that gets the job done and everyone goes about their life just fine.