<Tr> <Th_colspan="2"> Marriage Act 1961 </Th> </Tr> <Tr> <Th_colspan="2"> Parliament of Australia </Th> </Tr> <Tr> <Td_colspan="2"> An Act relating to Marriage </Td> </Tr> <Tr> <Th> Citation </Th> <Td> No. 12, 1961 </Td> </Tr>

What does the australian constitution say about marriage