COUPLES who say "I do" and stay married should get government cash bonuses, lobby groups say.
The Australian Family Association (AFA) together with the National Marriage Coalition (NMC) are lobbying for August 13 to be officially designated National Marriage Day.
AFA vice-president Mary-Louise Fowler says the date is symbolic because it's the anniversary of the passing of the Marriage Amendment Act 2004, which defined marriage as "a union between a man and a woman".
Ms Fowler said a national day was needed to recognise the effort that it takes to stay married and form a family.
It was the Government's responsibility to provide favourable policy for marriages to work, she said.
"One innovative idea is the idea of a marriage bonus - if you become married and you remain married for five, 10, 15, 25 years," Ms Fowler told AAP today.
"I believe we need to reward people who stayed married because of the benefits for society at large."
But the groups do not support gay marriage and claim to be working hard to defend the current definition under the 2004 Act.
"There's no such thing as gay marriage and the people lobbying for that are unfortunately misdirected because it's a bit like saying two tables make a dining room suite," Ms Fowler said.
"You need the complementarity for a marriage so we would never think of selling a dining room suite that had two tables so two men or two women simple cannot be married."
The groups say they want the support of both sides of politics to promote "a renewed culture of marriage".
They would not comment on Prime Minister Julia Gillard's relationship status.
The Christian youth movement Restoring Integrity and Sexual Ethics (RISE) is also backing the pro-marriage movement.
"In this sexually liberated society, girls have become sexual service stations for men and they just end up getting used," RISE representative Judi Limbers said today.
"We want to reach out to the disillusioned youth looking for something more."
The groups say their supporters will still celebrate the unofficial day adding they're not spooked by it coinciding with Friday the 13th.
AFA describes itself as ecumenical and non-political while the NMC says it aims to act as a "national clearing house" for information on marriage.