Rory Amon, 36, has consistently argued he thought a 13-year-old boy was of legal age before meeting him at the youth's apartment block in 2017.
The former Liberal politician has admitted having sex with the teen on one occasion in the building's car park toilet but says he had a reasonable belief the boy was over 16.
The pair met online on an adults-only website.
After a NSW Supreme Court trial, jurors were discharged in March having failed to reach a verdict over separate counts of indecent assault and the rape of a child.
Amon again pleaded not guilty these two charges as he was arraigned on Friday.
An estimated two-week retrial will commence on November 9.
In March, the jury acquitted Amon of four counts of child rape, two counts of attempted child rape and two counts of indecent assault of a child.
These charges related to an alleged second meeting with the teen which Amon denied occurred.
He was 27-years-old at the time and aspiring for a life in politics.
He would go on to serve two terms on Northern Beaches Council before being elected as the Liberal MP for the state seat of Pittwater in 2023.
The charges killed Amon's fledgling career in state politics, forcing his expulsion from the Liberal party and his resignation after his election in March 2023.
His exit had implications for the state Liberals, who lost the formerly safe seat to a teal independent at the subsequent by-election.
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