Support for same-sex marriage in Australia remains at 70 per cent, unchanged from a poll a year earlier, as the postal survey on the issue began today.
A new Fairfax/Ipsos poll suggests some 65 per cent of those surveyed are "certain" to complete the postal survey, and of those seven out of 10 will tick "yes" in favour of marriage equality.
Some 1400 voters were questioned between Wednesday and Saturday last week for the poll.
Survey forms asking Australians whether they support same-sex marriage are being posted from today.
The Australian Bureau of Statistics is aiming to get the forms out to 16 million voters by September 25.
Meanwhile Australian soccer is standing with the 'Yes campaign', supporting marriage equality in the postal survey.
Football Federation Australia chief executive David Gallop confirmed the sport's long-running support for same-sex couples to marry.
In doing so, the country's biggest participation sport joins rugby league and cricket's governing bodies.
"FFA is a founding member of Pride in Sport and supports its charter including marriage equality," an FFA spokesperson said.
Australia's football governing organisations - AFL, NRL and FFA - have history supporting the cause, supporting a float at the 2015 Mardi Gras.
The postal survey, which asks Australians whether they support or oppose same- sex couples marrying, begins today.
Responses will be collated in November.