A couple from Australia have said they will end their "sacred" 10-year marriage if Australia allows same-sex marriage.
It comes as
Gay rights advocates say Australia is now the only English-speaking developed country to ban same-sex marriage after
The Christian couple, Nick and Sarah Jensen, believe legalising same-sex marriage threatens the "sacred nature of the union" and leaves the door open to polygamy.
The couple from Canberra, who hope to have more children from their marriage, are prepared to divorce in protest, according to the Sydney Morning Herald.
Mr Jensen said that they both entered into their marriage "as a fundamental order of creation, part of God's intimate story for human history, man and woman, for the sake of children, faithful and for life".
He is director of the Lachlan Macquarie Institute which, along with the Australian Christian Lobby, offers scholarships in order to develop a Christian worldview.
"And so, if later on in the year the state does go ahead and changes the definition of marriage and changes the terms of that contract then we can no longer partake in that new definition unfortunately," he said.
Mr Jensen told Canberra CityNews: "My wife and I, as a matter of conscience, refuse to recognise the government's regulation of marriage if its definition includes the solemnisation of same-sex couples."
He also said that the definition of marriage may be expanded even further if same-sex unions are legalised.
He said: "Once you say that marriage is detached from children, [that it's] just about love, then when three people come to the state and say 'well we're all in love', then the state has no grounds, except unjust discrimination, to say why they can't get married.
"When it becomes detached to the child's right to a mother and a father and the sacred institution that it is, then suddenly it becomes meaningless and those boundaries can't be put back in place."