A 39-year-old man who had sex with a 14-year-old girl after giving her drugs has been sentenced to a little over one year in jail.

Parramatta District Court Judge Siobhan Herbert told Murat Kopuz, now 40, she had "faith" in him to reform himself.

Kopuz was given an sentence of one year and eight months with a non-parole period of one year and two months commencing on November 21, 2021 for common assault and intimidation charges.

He was also given a nine-month community corrections order for supplying prohibited drugs.

The judge argued that Kopuz had a long track record of being a "hardworking, law abiding citizen" before the failure of his marriage and separation from his son resulted in his substance abuse, the court heard.

"Right now, you're drug-free. If you walk out of jail, and you start using drugs, you're going straight back to jail," the judge told Kopuz on Thursday.

Kopuz, alongside Elham Naaman, drove the 14-year-girl to a hotel in Parramatta and gave her drugs including GHB and ice, the court heard.

The girl was later taken to a Greenacre property where she was allegedly detained and physically assaulted.

The judge told the court Kopuz had sex with her twice after giving her drugs.

Kopuz had also struck the girl and verbally threatened her, calling her a "foul f****ing slut".

When the girl begged to leave, Naaman threatened to break her legs.

"You're going to be our b**** tonight," she said.

Kopuz said the girl shouldn't have backchatted.

"You want to f*** with real girls? Watch, you're about to get jumped," he said.

"I'm not going to protect you this time."

He left the property while the girl was being assaulted.

Judge Herbert acknowledged that Kopuz was not aware that she was 14 but said there was a power imbalance regardless.

"You gave her drugs and you had sex with her," Judge Herbert said.

"You can be back to that man who owns a business, who can be proud of himself, who is a good father. That is up to you."

Naaman will return to court for sentencing in May.