Legal Talkback - Sexual assault or sexual insult?

Sydney Central Local Court Source: SBS Mandarin
Chinese actor Gao Yunxiang was arrested after a woman accused him of sexual assault in Sydney. While in several media coverage that released days later, the statement of 'sexual assault' has been changed to 'sexual insult', which sparks speculations toward the nature of Gao's behavior. What different charges would make from sexual assault to sexual insult?
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