A teenager who filmed intimate videos with two former girlfriends later posted the videos on a porn sharing website to "spite" them.

Spite led a young man to post intimate videos with two former girlfriends online to seek revenge after the relationships ended.

The 21-year-old man appeared in the Nelson District Court on Monday, and pled guilty to two charges of causing harm by posting digital communications as well as a charge of possessing cannabis.

The court heard how the man filmed an intimate video with his then partner in August 2015 when she was 18 years old. Sometime in mid-2017 he posted it on a pornographic video sharing website without her consent.

The same occurred in 2017 with his girlfriend at the time who was 16-years-old. The man filmed intimate videos of the pair on more than one occasion before posting the videos to the same site without her permission.

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When challenged by the second victim over Facebook the man claimed a friend had posted the videos and he offered her money if she didn't take the matter to police.

In explanation, the man admitted posting the videos and said he did so to spite the women over perceived grievances in the relationships.

Both were "distressed and upset" as a result of the man's actions.

Judge Richard Russell ordered a pre-sentence report with bracelet sentence options to be looked at and a referral was made to restorative justice.

"These charges are serious which you face and the circumstances are serious. Don't underestimate for a moment the seriousness of the position you are now in.

"All sentencing options are open, including the potential for a term of imprisonment."

The man was convicted and remanded at large to be sentenced on February 25.