In Victoria, obscene exposure carries a maximum penalty of 2 years imprisonment. A person will be found guilty of obscene exposure under section 19 of the Summary Offences Act 1966 if they wilfully and obscenely expose the genital area of their body in front of or within the view of a public place.
SUMMARY OFFENCES ACT 1966 - SECT 19 Sexual exposure SUMMARY OFFENCES ACT 1966 - SECT 19 Sexual exposure
http://www8.austlii.edu.au/cgi-bin/viewdoc/au/legis/vic/consol_act/soa1966189/s19.html
(1) A person (A) commits an offence if—
(a) A exposes (to any extent) A's genitals; and
(b) A intends to expose (to any extent) A's genitals; and
(c) the exposure is sexual; and
(d) the exposure is in, or is within the view of, a public place.
(2) A person who commits an offence against subsection (1) is liable to level 7 imprisonment (2 years maximum).
(3) It is not a defence to a charge for an offence against subsection (1) that, at the time of the conduct constituting the offence, A was under a mistaken but honest and reasonable belief that the exposure was not sexual.
(4) It is a defence to a charge for an offence against subsection (1) that, at the time of the conduct constituting the offence, A was under a mistaken but honest and reasonable belief that the exposure was not in, or within the view of, a public place.
(5) For the purposes of subsection (1), A's exposure of A's genitals may be sexual due to—
(a) the fact that A seeks or gets sexual arousal or sexual gratification from the exposure; or
(b) any other aspect of the exposure, including the circumstances in which it takes place and whether it is contrary to community standards of acceptable conduct.
(6) A's exposure of A's genitals is not sexual only because it is the genitals that are exposed. S. 19(7) inserted by No. 5/2018 s. 20.
(7) In this section, a reference to genitals includes a reference to surgically altered or constructed genitals.
SUMMARY OFFENCES ACT 1966 - SECT 17
Obscene, indecent, threatening language and behaviour etc. in public S. 17(1) amended by Nos 9509 s. 11(1), 9554 s. 2(2)(Sch. 2 item 313) (as amended by No. 9902 s. 2(1)(Sch. item 194(a)(b)), 9945 s. 3(1) (Sch. 1 item 100).
(1) Any person who in or near a public place or within the view or hearing of any person being or passing therein or thereon—
(a) sings an obscene song or ballad;
S. 17(1)(b) amended by No. 8267 s. 6.
(b) writes or draws exhibits or displays an indecent or obscene word figure or representation;
(c) uses profane indecent or obscene language or threatening abusive or insulting words; or
(d) behaves in a riotous indecent offensive or insulting manner— shall be guilty of an offence.
Penalty: 10 penalty units or imprisonment for two months; For a second offence—15 penalty units or imprisonment for three months; For a third or subsequent offence—25 penalty units or imprisonment for six months.
S. 17(1A) inserted by No. 47/2016 s. 24.
(1A) For the purposes of subsection (1)(d), behaviour that is indecent offensive or insulting includes behaviour that involves a person exposing (to any extent) the person's anal or genital region.
Example Mooning or streaking.
S. 17(2) amended by No. 37/2014 s. 10(Sch. item 160.8).
(2) Where in the opinion of the chairman presiding at a public meeting any person in or near the hall room or building in which the meeting is being held—
(a) behaves in a riotous indecent offensive threatening or insulting manner; or
(b) uses threatening abusive obscene indecent or insulting words—
Great information resources can be found here:
https://www.armstronglegal.com.au/criminal-law/vic/offences/obscene-exposure/
Nudity (Prescribed Areas) Act 1983
http://www.austlii.edu.au/au/legis/vic/hist_act/naa1983236.pdf