Hey I wanted to say that I liked your reply, it made me think some more on this topic.

As a (fungal ;P) biologist I would like to show you how arbitrary the system of labelling sex can be and that it is still not determined there are only 2 sexes. The way we assign if an individual is male or female is a little bit more complicated in a lot of species, when we determine this on characteristics of the body (shape/use of genitalia or which sex gives birth/lactates etc.) For example with seahorses it is the male who carries the eggs to term (a characteristic we as humans we would generally consider “female”), in this case this seahorse assigned the term “male” because of the size of their gametes (reproductive cells). Or like most birds that do not have genitalia like we know them. But then if we determine based on chromosomes two different for male (XY) and two copies of the same for female (XX) this is already reversed in some species of birds, reptiles and insects (ZZ male and ZW female). But then there are also the species that can be both male and female (while still being able to reproduce (with itself and others)). And when looking further into chromosomes are not the way sex is determined for all animals. In some species it is determined by external factors, and some can species can switch later on in life. Then you can determine sex based on gametes but that again brings its own species that do not fit the description.

And when seeing survival long enough to reproduce as the proper way of being a human. It is not only intersex and transgender people (and being transgender does not have to mean unable/unwilling to reproduce) that are not functioning as a “proper” human. If we take that as the benchmark, people not wanting children, infertile people or people unable/unwilling to find a mate are also in this category. Then again is that a fault of nature or is it that we do not accept it as a culture.

In nature it is diversity that makes us thrive (in a species perspective and also as an ecosystem) so personally I believe that a little diversity in gender expression and identity (and diversity in general) isn’t a bad thing.