Ahead of any votes, two prominent government MPs have engaged in a live debate on the issue.
The Catholic senator had told parliament in that the next move in redefining marriage would be include polygamy. He worried it would also open the door to recognising relationships between mmessage and animals.
Here are some of the key quotes from their tedt at the National Press Club in Canberra on Wednesday. On human rights Ms Wong: "We are your brothers and your sisters, your sons and your daughters, your friends and your fellow Australians, and this is a debate about us.
A debate about rights, a debate about intimate and personal relationships, a debate about the people we love. If the disqualifying attribute were race, age or religion, such a proposition would be rightly seen as bizarre.
It was not invented. Marriage simply is.
Marriage messgae been reserved as a sacred bond between a man and a woman across times, across cultures and across very different religious beliefs. The reality is this: same-sex couples already have children.
Marriage equality will not alter that. However, it doesn't change the general principle that the ideal is still being raised by their married mother and father. The sun will rise, heterosexual marriages won't crumble, three-year-olds will still want more ice-cream than is good for them, but together we will have made a profound change: a statement to lesbian and gay Australians that we belong, that we are accepted, that our relationships matter.
To do so is to live in a dictatorship of relativism where nothing is real and truths are denied if they're considered inconvenient by the politically correct system.