Wayne Jones, who was naked except for a pair of slippers, smashed a window to get inside the woman's Warrawong apartment and yelled: "I'm gonna come f--- you" as she fled in fear.

Jones, who pleaded guilty to the incident yesterday, later told police he had been watching her and intended to return to her apartment when he was released from jail, the court was told.

The 55-year-old had been smoking cannabis and drinking when he went to the victim's unit about 1am on October 9 last year.

He started banging on her door before he went to her window and smashed the glass with his fist.

When he entered the room, he told the woman he was going to have sex with her.

She managed to escape and call triple-0 while Jones wandered around the apartment, looking for her.

He noticed his hands were bleeding so he decided to have a shower, the court heard.

Police soon arrived and found Jones inside the unit.

He later admitted to breaking into the woman's apartment, punching the glass and then using a floor mat to soften his landing as he entered her home.

Jones, of Port Kembla, pleaded guilty yesterday to aggravated breaking and entering with intent.

The matter was adjourned for sentence to Wollongong District Court on February 8.