Three men have been jailed over the gang rape – recorded on a GoPro camera – of a teenage girl at a western Sydney house party.

Kurt Stevenson, 27, and Andrew Waters, 25, were last year found guilty of multiple charges related to the May 2015 assaults of the intoxicated 16-year-old girl at a St Clair party.

Crown prosecutor Sharon Harris during their trial 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.

On Friday, Judge Sharron Norton sentenced Stevenson to 13 years in jail and a non-parole period of nine years.

Waters was jailed for a 11 years and six months with a non-parole period of seven years and eight months.

Tristan Carlyle-Watson, 27, 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.

—AAP