If Australians didn't back a referendum on same-sex marriage, the Queensland Senator Glenn Lazarus, known as the Brick with Eyes, will turn up to Parliament House in a mankini.

The Palmer United Party turned independent Senator commented on fellow Queensland Canberra colleague Wayne Swan's recent admission he was wrong to stand against same-sex marriage and would now support making it legal.

Glenn Lazarus has threated to walk all the way to Canberra in a mankini. Credit:Tony Moore

Mr Lazarus told ABC Radio 612 Brisbane he was in favour of the move.

"As I said in the past I think there is way too much child abuse, too much abuse against women - I think if two people love each other, whether they've got penises or they've both got vaginas, they should be allowed to be married," he said.