Fabian Roy Meharry was a "monster of depravity" who would contact girls on social media, befriend and flatter them, then engage in sexually-explicit conversation and request images of them naked.

Then after he had the pictures of a victim, he would threaten to publish or send them to her family or friends unless she performed further sex acts for him live on webcam.

The 28-year-old Swan Hill BMX rider and businessman was sentenced in the Victorian County Court today to 12 years' jail with a minimum 10 for his abuse of 22 girls aged between 11 and 17.

He pleaded guilty to 62 child sex offences including rape, grooming and child pornography which spanned nine years.

Judge Liz Gaynor said Meharry would pester those girls he contacted until they succumbed to his "perverted" demands.

In some cases he created aliases such as "BMX Chick" or "USA Girl" to present as "friends" of his who would help bully and harass the victim into compliance.

On one occasion a victim asked to stop their Skype session to attend her own birthday party, but he told her: "OK have fun because all your friends will see the videos and pics with your face in it ... so you either spare five mins or I will never delete them and I'll send the pics to your mother right now ... you have two mins to reply or I'll send them."

Following a complaint, police raided Meharry's home in January 2015 and arrested him in August that year.

Meharry told a psychiatrist he knew his behaviour was wrong, but "most of the time I was just horny ... I didn't care who I talked to".

Judge Gaynor said Meharry's demands on the girls ranged from bestiality, to incest and ordering them to insert foreign objects.

"It would not be unfair to classify you as a monster of depravity," she said.

The judge did not accept Meharry's claims of remorse, saying he had ample time to stop offending after police raided his house, and instead continued at a greater rate.

Meharry deliberately sought out victims who were vulnerable because of their age and sexual inexperience, she said.

Most of the victims suffer anxiety and depression among many other ills as a result of their trauma, she said.

A victim's father told the court that being unable to protect his child was a pain "too great to bear".

Meharry has been on the sex offender register since 2008 when he was convicted for having sex with a 13-year-old when he was 18.

A judge urged him at the time to only seek age-appropriate relationships.

Judge Gaynor said Meharry was a "serious sex offender" but accepted his defence's submission not to impose a "crushing sentence".

She noted he'd been assaulted in jail as a result of prisoners finding out about his crimes through the media.

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