Sleazy university student, 20, sneaks through a 'sad and vulnerable' 15-year-old girl's window and repeatedly has sex with her - but he avoids jail

A university student has been given a community order and no jail time after repeatedly having sex with a 15-year-old girl and sending her 'sexually aggressive' messages.

Alan Yuen, from Melbourne, was about to turn 20 when he had sex with the Year 9 student on multiple occasions between October and December last year.

Yuen first slept with the 'sad and vulnerable' girl after he snuck through a window at her home at 2am. 

Their relationship was discovered after sexually explicit messages between them were found on her school laptop.

Yuen, a Monash University student, pleaded guilty to the sexual penetration of a child under 16 and was sentenced to a three-year community corrections order at the County Court. 

A 20-year-old man has avoided jail after sneaking into a 15-year-old's home and having sex with her (stock image)

The student was first questioned by workers from the Department of Health and Human Services after the conversations were discovered, the Herald Sun reported.

The prosecution described the messages between the pair as 'sexually aggressive'.  

During another secret encounter, the pair had sex in the back of Yuen's car late at night. 

Yuen, who was arrested on December 5, said the teenager 'didn't seem like a child' and told the court she had already had sex.

He handed his phone over to police who discovered the student once had asked if Yuen liked girls in school uniforms.

Yuen replied and joked if she would use his answer as evidence for his court hearings. 

Judge Rosemary Carlin said while there was no sign Yuen pressured the girl, there was a significant difference in their ages.

'Sexually aggressive' messages between the pair were discovered on the girl's school laptop (stock image)

'You were at very different stages of your life,' she said.

Eight character references for Yuen were given to the court and it was acknowledged he was remorseful and had no criminal history.

Along with his corrections order, Yuen will have to complete 350 hours of community service and Judge Carlin did not put him on the sex offenders register. 

Judge Carlin found there was no risk of him reoffending.