Neither sex nor gender are binary
All published research on sex and gender affirms that neither are binary.
Sex is a bimodal continuum of male & female, according to contemporary research.
https://www.nature.com/articles/s41562-020-00968-8
This spectrum also exists across species.
https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0238256
It's explored across fields and internationally.
https://link.springer.com/chapter/10.1007/978-981-19-5359-0_10
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5399245
Additional reading:
https://pubmed.ncbi.nlm.nih.gov/32735387/
https://journals.sagepub.com/doi/full/10.1177/2470289718803639