Attorney-General Jaclyn Symes said the system had been setup to focus on the victim, expressing the importance of the change.
"This will flip it," she said.
"This means the questions will be on the perpetrator: What did you do to ensure that you knew the person was consenting to sexual activity?"
The government will also amend laws to make the act of stealthing - removing a condom during sex without the sexual partner's knowledge - a criminal offence.