Two teenage boys involved in the sexual assault and indecent filming of an unconscious 13-year-old girl have been released without conviction.

The two boys, who cannot be identified because they are under 18, were 14 and 15 at the time of the offending in September last year.

The Youth Court heard after drinking with friends at the 14-year-old's house in Adelaide's north-eastern suburbs, the 13-year-old girl passed out on the couch.

It heard the 14-year-old boy inserted a shisha smoking stick into the unconscious girl's genitals, while the 15-year-old filmed the crime and took photographs on his mobile phone.

The court heard that the images and video were sent to friends on social media and then shared with more people.

It heard that after the offending, one of the boys sent a message to the girl saying:

"I'm so sorry, we were drunk I didn't mean to do that, neither did [the other boy], we don't remember anything."

The 14-year-old was charged with unlawful sexual intercourse and indecent filming of a minor and the 15-year-old with indecent filming of a minor and distributing images without consent.

Both pleaded guilty.

The prosecutor Tessa Diamandi said it was serious offending that had devastating consequences for the victim

"This behaviour is unfortunately too prevalent amongst youth of today," she said in court.

"Youths engaging in this behaviour [are] not really aware of the seriousness and far-reaching consequences of their behaviour."

The court heard the victim had been approached by people who had seen the video and she felt violated and did not want to leave her house.

It heard the girl now suffered from depression and anxiety and her parents had moved her interstate, as they felt it was the only way to give her a fresh start.

Teens remorseful for 'spontaneous' antics: lawyer

Lawyer Casey Isaacs agreed it was serious and concerning offending but said his clients were remorseful for their "spontaneous" drunken actions.

The court heard that one of the offenders and the victim had engaged in consensual sexual activity earlier in the evening.

"These are not sexual predators or anything of that nature," Mr Isaacs said.

"This was a night of firsts; first consumption of alcohol, first sexual experiences. On that background, some fairly poor decision-making was engaged in.

"The times are changing where social media and access to material online is unfortunately making our children grow up ever so quickly, when perhaps they are not equipped to do so."

Mr Isaacs said both boys had been bullied and labelled "rapists" by their peers and had changed school as a result of the incident.

He said the criminal proceedings had been a "sobering process" for his clients who had both reflected on their actions and now understood the consequences on the victim and her family.

Youth Court Judge Penny Eldridge said it was clear the boys now appreciated the seriousness of their offending and were ashamed and remorseful.

"If you were being dealt with in an adult court you would be looking at a sentence of imprisonment," she said.

Judge Eldridge said in line with the youth court's sentencing regime designed to enable the rehabilitation of juvenile offenders, she was prepared to divert the case out of the courts and into a family conference.

The conference involves juvenile offenders discussing their crimes and the consequences of their actions with police and counsellors as well as the victim, if they wished to be involved.

"Take advantage of the penalty that's been handed to you and obviously don't get involved in this sort of conduct again, because you've seen the consequences," Judge Eldridge told the boys.

She said the criminal offences would not appear on either boy's record.

"So in a sense you can start afresh and put this behind you," she said.