Monster dad subjected his own daughter to years of 'inhumane, depraved and degrading' sexual abuse and tried to convince her it was normal

A Northern Territory father who subjected his daughter to years of horrendous sexual abuse, including rape, has been jailed for 21 years. 

The man, aged in his 40s and who cannot be identified for legal reasons, pleaded guilty to a long string of 'depraved' sexual assaults on the girl in the Supreme Court.

The court heard the offender assaulted the girl 'every few days' over several years after taking custody of her in her mid-teens and attempted to groom her into thinking that such behaviour was not wrong.

Crown prosecutor Marty Aust said the man pretended to be concerned for the girl's welfare but 'what he instead did was isolate her, manipulate her and engage in a deviant and destructive course of conduct,' reports the NT News.

The prosecution detailed how the offender plied the girl with drugs and alcohol and raped her, including in public places and in 'degrading' scenarios, to the point where she was so harmed she eventually 'gave up and did not resist him'. 

Justice Jenny Blokland said his actions required 'denunciation in the strongest terms'.

'These are some of the most depraved and inhumane acts committed by one person on another that a court hears,' she said.

'The facts point out a serious level of depravity from the outset on the part of (the offender), he told (the victim) how it was normal for a daughter to have a sexual attraction to her father.'

'Ordinary people who adhere to widely accepted community values for which there is broad consensus have no ability to understand how any person could have reached this terrible place in their lives that such offences could be committed by them.'

 She also praised the victim for having the strength to speak up.

Justice Blockland this week sentenced the man to 21 years jail with a non-parole period of 18 years.

However, she warned him he might never be released as he fit the criteria for a serious sexual offender who can be held longer than their sentence if considered a danger to the community.