Johnathan Andrew Smallbon was sentenced to preventive detention by consent in 2007 after he admitted the attack on a 24-year-old man in Christchurch.
Smallbon was being monitored by police at the time as he was considered a high risk of reoffending.
He had been deported from Australia six months earlier after serving seven years in prison for sex attacks on two youths aged 14 and 16 in Sydney.
He moved into a boarding house in mid-2006 in December and lured his 24-year-old neighbour into his room under the premise of helping move furniture.
Smallbon held a knife to the man and tied him up on the bed using a telephone cord. He cut the victim's clothes away, gagged him with his own sock and threatened to kill him.
The sexual attack continued for 17 hours, and before Smallbon let the man go he throttled him until he could not breathe.
Smallbon was sentenced to preventive detention, meaning he will remain in prison until the Parole Board deems him suitable for release.
Even then he would remain managed by Corrections for the rest of his life and can be recalled to prison at any time.
Smallbon became eligible for parole in December, but he advised the board he would not attend his hearing.
"He says that he does not want to be released. He feels at risk to others," said his parole decision, released to the New Zealand Herald.
The decision revealed that Smallbon started sexually offending against males when he was 15.
"It involved kidnapping, detaining the victim at knifepoint, forced sex and strangulation ... Some were known to him; others were complete strangers."
While in prison in Australia, Smallbon began a sex offender treatment programme but was removed from it because he was aggressive and abusive towards staff and other inmates.
During his current sentence, he had participated in 65 individual psychological counselling sessions but indicated he had gained "little" from them.
He is not able to attend sex offender treatment programmes until he reduces his high security classification.
In January the board made a postponement order, meaning instead of being considered for parole in 12 months, Smallbon had to wait for three years. Again, Smallbon chose not to appear at the hearing.
"He signed a waiver, adding an abusive message," the board said.
"The bottom line is that Mr Smallbon is assessed as posing a high risk of violent and sexual offending ... Clearly he does not want to be released, and there is no possibility of that for the foreseeable future. Many things have to change before his risk will not be undue."
By Anna Leask of the New Zealand Herald
