The Parole Board has rejected a new bid for freedom by the man known as the Beast of Blenheim.
Stewart Murray Wilson is serving a 21-year prison sentence for rape, bestiality, stupefying, ill-treatment of children and indecent assault.
He was convicted and jailed in 1996 for sex offending involving female victims over a 23-year period.
He invited one of his victims, a Danish tourist, to stay at his Blenheim home, then drugged and raped her.
Wilson's six-monthly appeal for release was considered late last year.
In its decision released on Tuesday, the Parole Board accepted a psychologist's opinion that Wilson remained a high risk of committing further sexual offending and that he had made no attempt to reduce his risk through treatment.
The board said Wilson had refused to be interviewed by another psychologist acting for him.