Exposing your bare buttocks in public has been declared illegal in parts of Australia.

The state of Victoria has specifically outlawed mooning and streaking as part of a wider overhaul of the criminal code.

The offences were previously punishable as indecent or offensive exposure, but have now been explicitly listed under updated legislation. First-time offenders could face a two month jail sentence, while repeat offenders could be imprisoned for up to six months.

The legislation also outlaws singing "an obscene song or ballad".

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Justifying the changes, Martin Pakula, Victoria's Attorney-General, said: "I don't want to ruin anyone's fun".

He added: "We don't want a situation where someone who might streak at the cricket is funnelled into the same category as someone who might jump out in front of a 13-year-old girl and flash. They are very different types of offences and the legislation for the first time makes that clear ... Sexual exposure is of course a much more serious offence."

Lucy Valentine, an Australian writer, tweeted that it showed a "nanny state gone too bloody far", joking that mooning and streaking were "two of the most essential acts of civil disobedience".