A biologist explains the difference between sex and gender, and variations

Life is not binary after all.

https://www.youtube.com/watch?v=NQSu9LZ_HeQ

1,600 Scientists Just Signed A Letter Opposing A Legal Definition Of A Gender Binary

The open letter says that any attempt to define gender based on a person’s anatomy at birth or their genes is not grounded in science....
https://www.buzzfeednews.com/article/azeenghorayshi/scientists-vs-gender-binary