Dr. Martin Hash Podcast

Any cell of the human body has a clear biological sexual distinction, it's called the y-chromosome, and it controls the testosterone that turns a physically female fetus into a male. There are several kinds of hormonal anomalies that can happen: testosterone receptors not functioning, testosterone can't be converted from estrogen, etc. that create anatomic-females that have y-chromosomes. Sometimes these anomalous people don't even find out about their condition until they see a gynecologist about pregnancy. There are also similar female hormonal abnormalities that exhibit as males. These rare instances of transsexualism are based on physical science, so medical decisions can be made from an objective basis.

However, “gender identity,” as opposed to “sexual identity,” is when a person of obvious physical sexuality insists they are of the opposite gender, or even no gender at all. It's their attempt to subjectify something objective, and thereby gain control because only they can determine how society treats them. In fact, "Gender Dysphoria" is a recognized mental illness per se; this makes "gender identity" first & foremost a psych problem. The fact that some people treat it with surgery to become transsexuals doesn't change anything, just like Abasiophiliacs & ‎Apotemnophilias, people who want appendages cut off, aren't "cured" when the offending appendage is indeed removed. There are also societal impacts of allowing people to overrule science: for example, the recent trend of female sports being dominated by transgenders: if anyone can join, what's the purpose of having leagues separated by sex in the first place?