XX = woman; XY = bloke. Not hard really. XXY is tragic. Compassion when dealing with them.
Greg
You seem to be confusing the issue of transgender and transsexual people with intersexual. Transgender is not generally considered to be biologically based, intersexuality is. That is not to say that there is no relationship between the two and some transgender people will tell you that there is a physiological component to it. However, it is not well understood and it does not help to dumb it down to X's and Y's
It IS that simple; one is either biologically a male or female. Where there are problems then that has zero to do with gender; it is to do with lifestyle. Just look at the chromosomes for answers. If a person has genetic disorders then they require whatever treatment, if any, is available. Where they are "transgender" then they are preferring a lifestyle. Yes; they may be "nuts", but their choice. And now for every pedo in the country working out the new predatory environment.
Greg