Transgender is a broad term used to describe the experiences of people whose gender identity and expression do not match the sex they were assigned at birth. Some people transition to live as their preferred gender by changing their names and the pronouns they use to refer to themselves. They express their preferred gender through choice of clothes, hairstyles and other manifestations of gender expression and identity. Some transgender people undergo reconstructive surgery or take hormones to make their bodies more congruent with their internal sense of themselves. Others do not.Read more here.
Since the increased visibility of a transgender rights movement in the 1980s and a school-based LGBT "safe schools" movement in the 1990s, more young people have the language and information they need to identify the gender dissonance they experience between the sex they were assigned at birth and the gender identity that they know to be true for them. They are increasingly identifying themselves as transgender and they are doing it at earlier ages.
...Many of these young people want to play on their schools' or colleges' sports teams. As a result, athletic directors and coaches increasingly find themselves unprepared to make decisions about what team a transgender student is eligible to play for. As the number of transgender students who want to play on school sports teams increases, school athletic leaders must identify effective and fair policies to ensure their right to participate.
So who is it that is mistakenly "assigning" their gender at birth? Nature? In the postmodernist world, we get to simply decide what we are. We are nothing by nature. We can decide whether we're male or female. Can we decide whether we're humans too? I mean if X and Y chromosomes are not determinative of gender, then why should we pay any attention to the DNA that tell us we're human?
Transhuman. I can see it now. Can I be a plant? I can think of some people that are not terribly unlike vegetables.
There's nothing to stop people from denying reality, but are the rest of us really obligated to play along?