Same-sex marriage could finally be legal in Australia within days, with the House of Representatives expected to hold one final vote on the bill today.
The bill has already passed the Senate and could pass through the Lower House to become law today, pending the formal approval by the Governor General.
An extraordinary number of MPs – more than 100 – have given speeches during the debate.
Today, the Lower House will vote on amendments similar to those already defeated in the Senate, mostly from conservative MPs seeking greater religious protections for those who want the right to refuse to participate in same-sex weddings.
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Several government MPs, including Prime Minister Malcolm Turnbull, have said they will support or at least consider changes to be put forward by their conservative colleagues - namely Andrew Hastie and Michael Sukkar.
The Greens have also indicated they will propose amendments.
Labor will oppose any change, as will cabinet minister Christopher Pyne who branded some of them "superfluous".
If the bill passes unchanged from the one that cleared the Senate last week, it will become law.
If changes are successful, the bill will have to return to the Senate for approval.
Liberal backbencher Kevin Andrews, who is against same-sex marriage, believes the bill contains very little protection for religion and belief.
The former cabinet minister told parliament marriage was a "natural arrangement" between a man and a woman and pre-dated politics.
"To claim that there will not be a range of adverse consequences for the freedom of speech, religion and parental rights ... is wrong," Mr Andrews said.
"A significant concern that millions of Australians have about these proposed changes to marriage laws is the manner in which the freedom of speech and religion is threatened."
Liberal colleague Sarah Henderson, however, is backing the change.
In an emotional speech, she recalled the struggles one of her closest friends – John Parker, a gay man - before his death earlier this year.
"He really wanted to see this change in the law," she said through tears.
"One of the last conversations I had with him, he just said to me: 'Hendo, just bloody well get on with it, OK?' I say to my dear beloved friend who I miss dearly: JP, that's what we are doing."
