I got a little confused on the whole "sex is a social construct" idea. Not sure I entirely agree.
I was under the impression that (most) LGBT concepts can be divided into sex, sexuality, and gender. Sexuality being type of (direction, amount, lack of, etc.) attraction, sex being a biological concept, and gender having the subcategories of gender identity and expression.
Saying that sex is a social construct is entirely limiting! The spectrum of gender as a whole (thank you AP Psych:) biopsychosocial construct, but looking at the specifics, I'd still assert that sex is biological.
I still agree that one's sex is made of many characteristics, but those characteristics are the spectrum, not the social construct around it. It is normal for every human to have testosterone and estrogen, amounts vary amongst cis people too. Chromosomes can be XX, XY, or other. Genitals can be confusing as well. But just because it's a spectrum doesn't mean it isn't biological.
I guess what I'm saying is that, with my definition, gender = social construct, sex = biological construct.
Yes, this is coming from a cis white male, hope my opinion still counts. Let me know what you think, I'm open for discussion!