Michael Coby Netherwood, 21, was found not guilty of three counts of rape, but guilty of one charge of attempted rape, after contesting the allegations at trial.

The charges related to an incident on July 6, 2017, and involved his friend Jared Walsh, 21.

Walsh pleaded guilty to one count of sexual assault over the incident.

The pair went around to the woman's house in the afternoon to get cigarettes.

It had been alleged that Netherwood digitally raped the woman - who had a young baby - as she repeatedly told him to stop.

He was acquitted of the allegations, but found guilty of attempting to rape her by pulling down her pants and underwear.

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Walsh admitted to holding the woman's arm down.

The County Court recently heard the victim, who has a mental illness, has been badly impacted by the ordeal.

In sentencing Netherwood, Judge Damian Murphy noted the woman felt "dead inside".

Those in the room had been laughing when the woman's pants were pulled down, but Judge Murphy said "it was deadly serious as far as the complainant was concerned".

"What has happened has affected her and it has affected her in a form when it changed her life completely," he said.

"She feels more depressed, she does not want to go out.

"Feels she cannot do anything with her life, feels dead inside and she puts (it), people cannot really understand what she is going through and she has lost some important friendships.

"And she is still suffering these sequalae of these events.

"She is crying.

"Her anxiety has got greater."

Netherwood is serving a four month jail term imposed by a magistrate for other offending.

Judge Murphy imposed a two year community corrections order with 150 hours of community work when he is released.

"This was a case where the offending was in a sense a spur of the moment lack of premeditation event," he said.

"It went too far and now you find yourself, not for this offending, but for (other) offending, in an adult prison having a hard time of it."

Walsh, who lives at Killara with his parents, must perform 125 hours of community work as part of his community corrections order.