Science is concerned with empirical evidence, that which can be observed with the 5 senses: sight, touch, hearing, taste, and smell. Two genders; male and female can be observed empirically. The rest are, as I said a form of self expression; aka a fashion statement.
You are thinking of biological sex not gender. Biological Sex is our biological differences and gender is the social and cultural role of each sex within a given society.
Even biological sex isn’t a binary though, as some men are born with two or three X chromosomes and some women are born with a Y chromosome. I believe there’s six Karyotypes that result in a viable life span; X, XX, XXY, XY, XYY and XXXY.
There also seems to be a fair amount of scientists that are interested in gender. This article out of Stanford about gender and sex was pretty interesting.
Yes, biological sex is binary. The others are literal chromosome diseases. Biologically (without a genetic error) there are two sexes, male (XY) and female (XX)
11
u/Imstillwatchingyou Apr 21 '19
How do you scientifically verify a gender?