WARNING: Graphic content

THREE men have been jailed over the gang rape, which was filmed on a GoPro camera, of an intoxicated 16-year-old girl at a western Sydney house party.

Kurt Stevenson and Tristan Carlyle-Watson, both 27 and Andrew Waters, 25, were last year found guilty of multiple charges related to the assaults at a St Clair party in 2015.

NSW District Court Judge Sharron Norton on Friday sentenced Stevenson to a maximum of 13 years in jail and a non-parole period of nine years. Waters was jailed for a maximum of 11 years and six months with a non-parole period of seven years and eight months.

Carlyle-Watson, who did not have intercourse with the girl but was present in the room, was given a sentence of six years and four months with a non-parole period of four years and nine months.

During their trial, Ms Harris said the victim was drunk and believed she’d been drugged before the men sexually assaulted her “sometimes ... simultaneously, sometimes taking turns”.

The victim had “slow movements, floppy limbs” during the assault and repeatedly said she was tired and wanted a blanket, Ms Harris told the NSW District Court jury.

The trial, in August, heard the girl, whose identity has been suppressed, didn’t know she had been sexually assaulted until police contacted her after they viewed footage of the attack on a GoPro. The assault was only discovered when police arrested the owner of the GoPro for vandalism and discovered the horrific footage.

The Crown case was the girl was too intoxicated to have sex — but the defence argued during the six-week trial the sex was consensual and she “actively participated in sex”.

In her evidence, the 16-year-old told of being taken to the party where she was the only female and having a spiked beer “poured down my throat”.

She told the court of waking up naked in a room and not knowing where her clothes were.

“I was sick, my belly was sore, I was bleeding everywhere,” she said.

The 16-minute GoPro footage was played to the jury and contained comments allegedly made by the men including “are you ready for the next one” and “just bend her over the bed”.

The court was cleared while the footage was played to the jury.

In her closing statements to the jury, Crown Prosecutor Sharon Harris said Stevenson could be seen having sex with the girl while Waters stood naked watching and “waiting his turn”.

At one point the GoPro panned around the room and captured men watching and laughing.

When he gave evidence during the trial, Stevenson insisted the sex acts with the 16-year-old were consensual.

“[She was] actively participating ... She never tried to stop anything, never said no ... to stop ... I had no doubt it was consensual.”

He became worried when he heard there was a video of what happened because “I didn’t want it put on social media or anything like that”.

The person who recorded it laughed and told him it would be deleted.

Stevenson was overheard in a conversation — covertly recorded by police — saying he was “flipping out right now” after he learned police were investigating. Stevenson said he reacted like that because he was “scared of being accused of something I didn’t do”.