I moved from a Mars colony to Earth and learned that humans have another gender.
They are called "men". Some are castrated and put into social work, while others are kept in captivity for breeding.
I was greatly shocked. It turns out that this is how humans reproduce.
"These, uh, men, wouldn't they want to be free?" I asked the man showing me around the Stallion base.
She replied: "No, it is precisely because historically uncastrated men have been so prone to aggression and endangering social security that humans have decided to become what we are today."
Purpose: Equality