BBC – Future – The complex circumstances that defined your gender:
“Are you a man or a woman? The chances are you have a strong feeling either way; probably one that’s been with you since infancy and corresponds to your genitalia. But not necessarily. Some people have always believed they were born into the wrong gender; in others, these feelings didn’t develop until later life. Some may opt to surgically change their body to match their gender identity; others may occasionally cross-dress; or do nothing at all. Then there are people who feel neither masculine nor feminine, but somewhere in between. It takes all sorts to make a world, they say, and this is certainly true of gender.”