Alleged Australia Day rapist denies 'hilarious' assault comments

Bailey Hayes-Gordon leaves the District Court in Brisbane. Photo / AAP

One of three men accused of raping an unconscious teenager with a bottle at an Australia Day party says he was "over-exaggerating" when he described footage of the alleged assault as the "funniest thing I've ever seen".

Bailey Hayes-Gordon, Jacob Watson and Nicholas Jackson have pleaded not guilty in the Brisbane District Court to one count each of rape in relation to the alleged assault of a 19-year-old in 2015.

Taking to the witness box on Wednesday, Hayes-Gordon denied prosecution allegations he penetrated the complainant with a bottle and only changed his story after being charged with the offence.

It comes after the jury heard footage of the alleged assault was later shared in Facebook conversations, with Hayes-Gordon accused of posting the video and screenshots.

He then allegedly wrote: "(The complainant) passed out so we stuck a bottle up his a*** and he just took it ... Funniest thing I've ever seen, legit."

"Did you over-exaggerate when you included yourself as part of the group that 'stuck a bottle up his a***'?" crown prosecutor Caroline Marco asked the 21-year-old.

"I did over-exaggerate it, yes," he said.

"And it's an over-exaggeration that I said 'funniest thing I've ever seen'".

"Initially I thought it was funny, but after seeing how serious this incident was ... he's my mate, I shouldn't have done that."

He said he believed the bottle did not actually penetrate the complainant's anus and said there was "no uproar" afterwards to suggest he had been injured.

Earlier, Hayes-Gordon described the dynamic among his friends as "prankish" and said they often teased each other.

Asked by Ms Marco if his social media messages were the true account and he'd changed his story after being charged, he said: "That's completely not true".

The prosecution alleges Jackson rolled the teenager over and restrained him by his feet, Watson took video footage on his phone and Hayes-Gordon - as the principal offender - inserted the bottle.

Watson and Jackson elected not to give evidence in the trial, which will hear submissions from the prosecution and defence later on Wednesday.