Senator Louise Pratt, whose partner was born female and is now identified as a man, said the reform was a major improvement for travelers who face questioning and detention at airports because their appearance does not match their gender status.

“‘X’ is really quite important because there are people who are indeed genetically ambiguous and were probably arbitrarily assigned as one sex or the other at birth,” Pratt said. “It’s a really important recognition of people’s human rights that if they choose to have their sex as ‘indeterminate,’ that they can.”