It is interesting to note that the mantra was for years that one could not choose to be gay, but that it was a "wired in" characteristic. That's ultimately a question for science, but it seems intuitively correct to me.
But now the mantra is that gender itself is a matter of choice. You are a girl if you consider yourself a girl, notwithstanding your junk dangling down.
The left needs to seriously get its act together. Either balls have meaning or they don't.