Gender ambiguity occurs in roughly 1 in 100 males. And that's just the obvious gender differences.
Since the early 50s, doctors would try to "correct the problem" by assigning a gender.
When my mom died, my father sent records she had kept in a sealed envelope. When I opened it, there were pictures of me at various ages, but there was also that hospital "Birth Certificate" that had the footprints on it. What was interesting was the name was "Ballard Boy?" - yes, there was a question mark.
My father had to explain before I found out that other boys had them, that I didn't have testes like most boys - mine were "up inside like ovaries".
When I was in my late thirties, my girlfriend was curious that instead of the straight seam down my scrotum, I had a zig-zag all the way down. I did some research and found at that this was probably because I was manually sown together by a doctor - probably a day or two after my birth.
There are even rare cases of males who have a uterus and periods, with the blood draining into the colon or rectum.
Often, since men aren't old enough to recognize bleeding until they are in their late 50s, they may not recognize blood in the stool.
Doctors have been trying to find better ways of determining gender, and when in doubt assign to male. It's easier to turn a man into a woman later than it is to turn a girl into a man later in life.
Far more common, in 1 in 10 males, is the physiological markings that indicate that the male did not have enough testosterone during the first 8 weeks - when the brain and bones are developed. Often, a longer index finger indicates a more feminine bone structure, and usually a more feminine brain. They have a smaller limbic system, more white matter, and smaller hypothalamus. Even by 2 it's obvious that they not only don't fight much, they don't even try to defend themselves. They behave more like girls, wanting to color, play with dolls, and make up stories.
I even have a theory as to why transgender males are more common since the 50s. For centuries, alpha males were the leaders, the most desirable, and the most likely to reproduce. However, when war transitioned from swords, axes, and clubs to rifles, huge populations of alpha males were killed by men whose ability to hold back, wait, be patient, carefully aim, and take their shot, men who did not rush into shooting the first moment they thought they might be able to hit something.
The Napoleonic wars, the Civil war, World Wars I and II each killed huge populations of alpha males - those who eagerly took the first wave, or volunteered to be in the trenches and went over the wall, were usually bunched up and mowed down with machine guns. Some of the most feared soldiers were the Scotch, the Irish, and the "Colored" groups, because they would aim for the legs, which mean those who were shot were unable to move, stuck in no-man's land, and the snipers would pick off everyone who tried to rescue or help any of the injured.
To make matters worse, millions of men who survived word war I died of Spanish flu, Scarlet Fever, or Polio - which ravaged millions of people but seemed to be very hard on alpha males who couldn't deal with being helpless and therefore didn't take the time to heal. If 70% of the alpha male population was killed off, and those who had rear duty, or who were 4F because they were too feminine to fight, to meet the criteria to enlist, would have reproduced, expanding the transgender population.
With Vietnam and a huge prison population and gang wars, the alpha male population is shrinking even more, while transgender males who focus their interest into non-violent non-alpha careers, medicine, science, technology - the same skills that once made transgender males respected as wizards and warlocks.
Perhaps now that so much of our urban population is so densely packed together, the skills of the wizard, the arbitrator, the negotiator, the advocate, the healer, are far more valued and needed than the hunter, the fighter, and the strong alpha male.
In rural areas, the farms, the ranches, the alpha males are still needed to a lesser degree than before. A farmer can now plow and harvest huge crops with a hand-full of highly skilled workers who drive tractors and combines. Even the irrigation is automated on most farms. Ranches still need men who can rope and brand the cows, but trucks huge trailers and good rail service have made long cattle drives through multiple states much less necessary.
However, Alpha males are very used to having the perks of power. Suddenly, they are seeing omega males, feminine males, what they consider the bottom of the pecking order, the sissies, the nerds, the book-worms. For the last 40 years, these have become the dominant and highest paid, while the alpha male, the blue collar worker, the fighter, has become far less popular, less successful, and in the wake of feminism, less desirable.
Maybe we are supposed to be more transgendered as a culture, even globally. In a recent survey of transgenders, there were over 9 million english speaking respondents. That's the equivalent of 3% of the total population - 1 in 30 people, who is transgendered. Furthermore, if most of those respondents were men, that could be 7% of the male population, 1 in 15 or 1 in 14. And each of those people has friends, family, coworkers, schoolmates.
How does the medical community respond to this? How does society respond to this?