After some deliberation a Whanganui District Court Judge has added Richard Glen Lisle's name to New Zealand's child sex offender register.

The 29-year-old pleaded guilty to three charges in Whanganui District Court last week. They were exposing a young person to indecent material, assisting someone under 18 to provide sex services and a charge of driving while under the influence of alcohol.

The sexual offending took place about six months ago.

No details were given, except that the victim was aged 15 and was vulnerable. The activity involved messaging, and the harm to the victim was significant, Judge Philip Crayton said.

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The offending was "surreptitious", a breach of trust, and had "a number of sinister aspects".

The driving with excess breath alcohol matter added to risk that Lisle would offend in future, Judge Crayton said.

Lisle's lawyer, Stephen Ross, said the offending was at the low end and out of character for his client. He had not shown any deviant behaviour.

The community was at risk, Judge Crayton said, and Lisle would come into contact with children due to his family circumstances.

He directed Lisle to undertake the WellStop programme for adult sex offenders. It is delivered in Palmerston North, and there will be transport available to get him there.

Lisle is also to undertake two years of intensive supervision.

On the driving with excess breath alcohol matter Lisle was sentenced to 60 hours' community work and disqualified from driving for six months.