A teenager who sexually assaulted a woman near a Perth train station on his 15th birthday has avoided immediate detention and been warned by a magistrate to 'get off the porn ' . The boy , who can not be named , was sentenced in the West Australian Children 's Court on Thursday to a 10-month conditional release order , which includes 80 hours of community service and counselling . The court heard the 22-year-old victim was attacked after getting off a train at Warwick station in October . The boy grabbed the woman from behind , touched her breast and put his hand under her skirt before she broke free and said : 'What the f*** are you doing ? ' A teenager sexually assaulted a woman on a cycle path ( pictured ) near a Perth train station in October . The court heard the 22-year-old victim was grabbed from behind and the boy was still wearing his school uniform . Defence lawyer Hylton Quail said the boy had developed an addiction to pornography and , as he went through puberty , his Christian family did not discuss sexuality . He said the boy was trying to act out what he had become obsessed with from watching pornography , which was to grab her bottom , but as he started acting out his fantasy it escalated . Mr Quail described the teenager as a 'silly young boy ' whose parents had since stopped him from accessing the internet on his own at night . Prosecutor Genevieve Cleary said the attack was premeditated but unsophisticated because the teenager was wearing his school uniform and could be easily identified . 'This was a random , frightening attack on a young woman who was simply going about her business , ' she said . The boy , who can not be named , was sentenced in the West Australian Children 's Court on Thursday . Magistrate Andree Horrigan noted letters from the boy 's coach , principal and family friends who said they were stunned , deeply shocked and surprised by the offending . But she said they did not know about the boy 's 'nocturnal activities ' . She added that the crime was degrading and invasive . ' I could not imagine a more serious set of circumstances , ' she said . 'It 's just disgusting . ' Magistrate Horrigan said the boy 's behaviour was 'entirely and grossly unacceptable ' and warned him to be more respectful . 'You do not know what you take from people when you behave like this , ' she said . 'You take people 's confidence ... It 's going to have a lasting impact on her . ' Sorry we are not currently accepting comments on this article .
The teenager sexually assaulted a woman near a Perth train station . The court heard the 22-year-old victim was grabbed from behind . He touched her breast and put his hand under her skirt . She broke free and said : 'What the f*** are you doing ? ' Defence lawyer Magistrate Andree Horrigan said the boy had an addiction to pornography . Hylton Quail said the boy 's behaviour was 'entirely and grossly unacceptable ' He was sentenced to a 10-month conditional release order .