I must say that post modern “thinking” confounds me. Anyone who thinks that there is “more than two sexes” is either unfamiliar with basic biology or just plain crazy-stupid. Retarded even.
To suggest that X and Y chromosomes just don’t matter is to bury basic biological facts. Females have XX and Males have XY. It is a simple matter of cells under the microscope stuff.
Like Down’s Syndrome for example, caused by the presence of one extra sex chromosome.
I am sure if you asked her parents or siblings, they would think that X and Y chromosomes DO matter.