If you set up a profile on Facebook you can now choose to describe yourself as male, female or custom. If you select custom you get 70 different gender options. You also get to choose which pronouns will be applied to you.
The innovation was brought about by two Facebook engineers, one a lesbian, the other a transwoman (a man who wants to identify as a woman).
The problem with all this is that there are only two sexes. There is male and there is female - those are the two possibilities not only when it comes to our biological sex, but also when it comes to an "essence" of life.
That doesn't mean that every particular man and woman has a clear identity as male or female. Things can go wrong biologically (a very small percentage of people have chromosomal abnormalities); nor is it the case the everyone will psychologically accept their biological sex as part of their identity.
But, be that as it may, the fact remains that there are only two sexes. We cannot make up a new one of our own.