Tasmania is expected to become the first state in Australia to have gender optional on birth certificates, a move that will make the state more intersex-inclusive.

The bill was part of nine amendments to the government’s marriage bill, according to ABC, all of which passed with the deciding vote of Liberal Speaker Sue Hickey. But the decision is still meeting opposition from the Liberal Government.

 "Tasmanian parents will be disgusted that the Labor and Greens parties are doing social experiments on their kids and taking their sex off their birth certificates," Government minister Michael Ferguson said.

However, Hickey believes the opposition is due to the “extreme right” of her party.

"People have to realise the Liberal Party has a very strong, right-wing Christian element, and I would hope that I can give hope to people with Liberal values that you can be a Liberal without necessarily being extreme right," she said.