The majority of Australians concede it's only a matter of time before same-sex marriage is legalised, a new poll suggests.
Lobby group Australian Marriage Equality is using the Galaxy poll, which it commissioned, to call for gay marriage to be legalised.
Around 75 per cent of respondents agreed it was inevitable that Australian laws would be changed to allow same-sex marriage.
"The tide of history is running towards equality and nothing can turn it back," Australian Marriage Equality national convener Alex Greenwich said in a statement.
"Our plea to the nation's leaders is to get on with this reform instead of unnecessarily prolonging a debate."
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Parents and Friends of Lesbians and Gays spokeswoman Shelley Argent also welcomed the new poll.
"Australia is ready for equality for our gay and lesbian children, so it's now time for political leaders to act," she said in a statement.
Ms Argent is also launching a new TV ad campaign arguing the case for gay marriage.
Federal Labor will discuss its position on gay marriage at the ALP national conference in December.
The Galaxy telephone poll of 1000 people was conducted at the end of May.
The Australian Greens says the latest poll backs the case for a conscience vote on gay marriage in parliament.
"This is an issue that has dogged Julia Gillard since she became prime minister," Greens spokeswoman Sarah Hanson-Young said in a statement.
"Ms Gillard can end what is becoming a political headache by giving all Labor members a conscience vote on this issue."
The Greens currently have a marriage equality bill before parliament.
The Christian lobby says the poll was structured to give a desired result, without questioning the consequences of redefining marriage.
"Asking people if it's inevitable the law will change is a loaded question," Australian Christian Lobby spokesman Lyle Shelton said in a statement.
The gay rights agenda to redefine marriage was "insensitive to the needs of children and the cultural and even religious views of the vast majority of Australians," he said.
The lobby urged Labor to honour its election promise to maintain marriage as being between a man and a woman.
