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Sex refers to 2 out of the 3 things you’ve mentioned there. Hormone Levels and Function, and Reproductive/Sexual anatomy.
We can’t change chromosomes (and gene expression is essentially the same category here) - so it’s literally our closest attempt at altering sexually dimorphic characteristics. I’ve been told time and time again gender is fluid, can change on a day to day basis, is based on socially constructed roles, and the jury is still out on if it has nothing to do with sex, or has everything to do with sex. I’ve heard answers from both sides on that one.
So it makes no sense to me why we allow it to be called Gender reassignment.
I don’t understand how you thought this guy was being a dick just because he said “fucking stupid”…are you really that sensitive? He’s right. Keeping some clear plastic on you at all times, because one day you might have a 0.000001% chance that you need to use it to obtain fresh water…is stupid. It’s fucking stupid.
There’s plenty of plastic already freely available out in the environment already! You’d only be adding another piece of plastic!
Unless you … bring it outside of the environment…