The following information is sourced from the Austlii.edu.au site which provides information on statutes of Western Australia.
If you need legal advice we strongly recommend you speak to a qualified legal practitioner.
Excerpt from the Criminal Code (WA):
222. Term used: assault
A person who strikes, touches, or moves, or otherwise applies force of any kind to the person of another, either directly or indirectly, without his consent, or with his consent if the consent is obtained by fraud, or who by any bodily act or gesture attempts or threatens to apply force of any kind to the person of another without his consent, under such circumstances that the person making the attempt or threat has actually or apparently a present ability to effect his purpose, is said to assault that other person, and the act is called an assault.
The term applies force includes the case of applying heat, light, electrical force, gas, odour, or any other substance or thing whatever if applied in such a degree as to cause injury or personal discomfort.
223. Assault is unlawful
An assault is unlawful and constitutes an offence unless it is authorised or justified or excused by law.
The application of force by one person to the person of another may be unlawful, although it is done with the consent of that other person.
The offences that constitute the different severeties of Assault are contained within the Criminal Code and can be found through the following link:-