The Galaxy poll of 1200 Australians, commissioned by the Australian Marriage Forum, found three out of four respondents agreed society should try to ensure children are raised by their own mother and father.
Almost 50 per cent said it was more important for a child to have a mother and a father than the right for two men to marry and create a family, while 30 per cent agreed both were equally important.
Almost 20 per cent said the right of men to marry each other was more important.
Forum president David van Gend told reporters in Canberra on Thursday that Australians needed to understand that legalising same-sex marriage would violate the birth right of children to have both a mother and a father.
“You cannot have both,” he said.