I say neither gender nor sex is a choice. What about all our followers?
I think it depends on the person. I would say for most people, it isn’t a choice. However some people who are gender-queer may decide to identify as one gender or another perhaps for simplicity’s sake or other reasons like that. Or gender-queer, gender-fluid or bi-gendered people may decide/choose to switch it up depending on how comfortable they’re feeling that day/week/month.