'I never knew my partner was a sex offender'

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Andrew Williams is a principal lecturer in criminology and criminal justice at the University of Portsmouth and has done extensive research in this area of law.

He said child sex offenders "often groom not just the victims but also the significant others".

"In this case it sounds as if he's groomed the women in order to hide, minimise his previous offending, front-stage 'normality' so he can continue offending against external victims under the guise of respectability," he added.