The Australian Sex Party will come to an end this week, with founder Fiona Patten set to deregister the party and unveil a new political party to reach more voters.

Ms Patten, who founded the Sex Party in 2009, is set to launch the Reason party on Tuesday, in an effort to appeal to a broader base ahead of state and federal elections.

Fiona Patten hands out how to vote cards for marriage equality at Flinders Street Station. Credit:Wayne Taylor

The Sex Party originally had strong links to the Eros Foundation, which represents businesses in the adult film industry. But Ms Patten said the foundation played no official part in the new party and had already begun moving away from the Sex Party.

Ms Patten, who was outside Flinders Street Station on Monday handing out how to vote cards on same sex marriage, said the Reason Party would continue to advocate for key Sex Party policies, including legalisation of illicit drugs and euthanasia laws.