Bill Shorten to introduce gay marriage bill to parliament

Reminiscent of Gough Whitlam's famous political battle cry, Bill Shorten will introduce his gay marriage bill on Monday, telling parliament "it's time" to make equality a reality.

The opposition leader is hoping to garner support from the federal government to co-sponsor his private member's bill, but Prime Minister Tony Abbott has repeatedly said that while it's an important issue, he is focused on getting his budget passed.

Mr Shorten will tell the House of Representatives that the marriage law as it stands no longer represents modern Australia and will urge politicians to pass a law of which they can be "collectively proud".

"We can declare, in the house of the Australian people - `it's time'. Time to make marriage equality, a reality," he will say.

He says that no one should imagine this change is inevitable and will just happen, parliament has to step up and "rise to this moment".

"When someone has found not just another person they can live with, but a person they can't live without ... then they should have the same right to the true qualities of a bond that runs deeper than any law," Mr Shorten will say.

They should have the same joy and sacrifice, the same care and compassion and the same rights and responsibilities.

"We also send a message to all young, same-sex attracted Australians. We are proud of you, for who you are. You belong."