City of Sydney Relationships Declaration
Other institutions such as the Registry of Births Deaths and Marriages no longer accepts an Australian Marriage Certificate as a form of ID – this creates an equal situation for both opposite sex and same sex couples as both are not allowed to present their relationship certificates as a form of ID.
Identity documents in the United States
The Social Security number (SSN) and card are issued by the Social Security Administration. Almost all parents voluntarily apply for a Social Security number shortly after the birth of a child. In the absence of a national identity card (and concordant national identity number), the Social Security number has become the "de facto" national identifier for a large variety of purposes, both governmental and non-governmental.