Liberal Senator Cory Bernardi says he has been "proved correct" that legalising same-sex marriage would lead to demands to endorse polygamy and bestiality.
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"I stand on the record and say, well I was right," said Senator Bernardi, who was forced to resign last year as Tony Abbott's personal parliamentary secretary following public outrage about his comments.
Senator Bernardi's latest comments come as a Greens bill to recognise internationally sanctioned same-sex marriages is set to be debated in the Senate on Thursday.
The same sex-marriage bill was also debated last night in the Federation Chamber, with Labor MPs Greg Combet, Stephen Smith and Bernie Ripoll all saying they supported legalising gay marriage. As Kevin Rudd did recently, Mr Ripoll said he had changed his mind and would now support the bill.
Amid these developments, Senator Bernardi told Fairfax Media that some sections of society were now moving in the "abhorrent and disgusting" direction he had predicted.
"There is actually now a petition been put together for the House of Representatives by Green activists to legally recognise multi-member unions," Senator Bernardi said.
He was referring to a recent petition by the Polyamory Action Lobby in which the group said: "We demand nothing less than the full recognition of polyamorous families".
"Now I said that would happen," Senator Bernardi said. "It's happening.''
"I think there should be alarm . . . If you're going to re-define a word to satisfy demands of a minority then you're going to face continuing demands in that space.''
Senator Bernardi also stood by his controversial comments last year that the "next step" after recognising same-sex marriage was to support "creepy people" who chose to have sex with animals.
"Bestiality, of course it was an extreme example, but once again it's linked to the radical agenda of the Greens Party," he said.
Greens Senator Sarah Hanson-Young said Senator Bernardi's comments demeaned all Australians with friends and family in gay relationships.
"Linking the love that thousands of Australians have for each other to bestiality is disgraceful," she said.
"Once again Cory Bernardi has attacked gay and lesbian Australians and has humiliated his party."
The Greens want marriage to be between two people regardless of their gender, Senator Hanson-Young said. The party does not support any other changes to the Marriage Act.
Senator Bernardi said he was simply speaking his mind and he accused other politicians of changing their positions for political convenience.
"[Kevin Rudd] used to hold the doorstops outside of church and now he's suddenly had this epiphany about same-sex marriage," Senator Bernardi said.
Mr Rudd is among a number of Labor politicians who support the legalisation of same-sex marriage, though Prime Minister Julia Gillard maintains her personal opposition.
Opposition Leader Tony Abbott has refused to allow a conscience vote within the Coalition despite party members including Kelly O'Dwyer, Malcolm Turnbull, Wyatt Roy, Simon Birmingham and Sue Boyce all supporting same-sex marriage.