Why Does Humankind Consist of Men and Women?

Perhaps it is obvious that humankind should consist of men and women, two genders, not just one. After all, “it takes two to tango” doesn’t it? But, on the other hand, why would one kind of human being not have been enough? Problems between the two genders have occurred throughout history, often with disastrous results, … More Why Does Humankind Consist of Men and Women?