𝓝𝓪𝓽𝓪𝓵𝓲𝓮 𝓦𝔂𝓷𝓷  💎

However when we say that someone is biologically male or female, we're generally describing a cluster of anatomical and physiological

characteristics (hormones, genitals, secondary sex chars), not just a role in reproduction.

So, when we use "sex" to refer to these clusters, it is incorrect to say there are only two discrete sexes, when many people exist in the

middle of the venn diagram. (e.g. male gentials but female hormones and breasts, XY chromosomes but vagina/uterus (Swyer syndrome)).

You might want to read on ovotestis, an organ with characteristics of both ovary and testis. https://www.ncbi.nlm.nih.gov/pubmed/24251183  https://www.ncbi.nlm.nih.gov/pubmed/28412334 

this is pretty fascinating

Another issue is that more than a few people do not talk about gender in strictly reproductive terms; they also use it define social norms.

Do you think someone who considers various gender identities valid is going to say "b*tch make me a sandwich?" at some point? Probably not.