I was attracted to hard sciences because the subjectivity of things like psychology turned me off. Statements like yours make me concerned that liberal arts departments are going to try to make science fit their narrative. The roles of male and female is one of the most universally common behaviors across specifies. If I grew a vagina and had a baby it doesn't make me a different gender. It means I took on some of the attributes of a human female. At that point I wouldn't consider myself male or female. But I certainly wouldn't try to make up a 3rd gender for my unique situation.
That's a very positivist approach, and I hope the liberal arts continue to erode such binary based thinking in the sciences as I believe that philosophy makes better scientists. . And so what if you "made up" another gender? Gender is socially constructed and is not a real, concrete construct. I'm sorry that considering concepts and people as unable to be hyper taxonomized by artificial constraints is inconvenient to you and more valuable than treating the identities of others with respect.
Very good point, but in nature a binary of sexes is not absolute. You are applying the artificial gender binary to sexes, which in nature are often messy and unclear. This can range from species that change sex organs as they mature, take on different reproductive roles dependent on situations, and even manifests in a statistically significant amount of humans born with both sets of reproductive organs. Assuming two sexes, then going on to conflate that with gender, demonstrates only an elementary understanding of reproductive biology.
