​A man facing a possible life sentence over his alleged role in the gang rape of a teenage girl at a western Sydney party has failed in his bid to be released on bail.

Tristan Carlyle-Watson allegedly contacted the 16-year-old girl over Facebook and invited her to the party at St Clair, where he is said to have given her alcohol and cannabis.

Video footage helped convict Tristan Carlyle-Watson and two other men of raping a teenage girl, but it is rare to have such conclusive evidence in sexual assault cases. Credit:Facebook

It is alleged she blacked out a short time later and that, as she drifted in and out of consciousness, she was sexually assaulted by several men.

During a bail hearing on Wednesday, the NSW Supreme Court heard that the alleged attackers took turns having sex with the teenager and filmed themselves in the act using a GoPro camera, and that Mr Carlyle-Watson was captured on film laughing.