I am a scientist. There are essentially 2 types of sex – Male or Female with organs and at maturity, hormones that reflect this genetic makeup. A defect in the hormonal or structural development may lead to ambiguous genitalia. To resolve the issue, the genetic sex is determined by Chromosomal analysis and with reconstructive surgery and hormonal manipulation, one or the other sex is attained for the individual.
This is why I think the transgender argument and protest is an issue of the mind. This is where mental counsellors should come in. I honestly think a number of people have too much free time on their hand!