Mr Campbell, 52, has pleaded not guilty to murdering Mrs Campbell, his wife of six months, during a camping trip in the Royal National Park in March 2005.

Crown prosecutor Mark Tedeschi, SC, told the jury during his closing submissions that Mr Campbell had no genuine love or affection for his wife, as he was seeing other women while wooing her and after they had married.

"We would submit that the accused didn't care about the risk of Janet finding out about his other girlfriends because he knew he would not have to keep up the pretence for very long," Mr Tedeschi told a packed Supreme Court, including many of Mrs Campbell's family members.

Mr Tedeschi said Mr Campbell "minimised that risk by murdering Janet" six days after she came to live at their marital home in Otford.

"The accused was only out to maintain his coterie of women because he was charming to each of them and he was out to skilfully weave his web of lies to keep them apart."

He said Mr Campbell knew that if his wife found out about his affairs she would most likely have divorced him, leaving him with little financially.

He had "learnt his lesson" from a previous relationship with an English woman named June Ingham. He had used her money to buy a home for them and he refused to pay it back after he sold the house following their break-up. She took him to court and he had to pay her $9000.

There were similarities between his relationship with Mrs Campbell, Mr Tedeschi told the court.

"We submit that you would conclude that his reason for being in each of these relationships and his reason for ingratiating himself was for financial benefit, for what he could get out of it."

The court heard that, after his wife's death, Mr Campbell had told his parents she was "the love of my life".

"Was this the same love of his life that he described as ... being so f---ing ugly he couldn't bring himself to shag her?" Mr Tedeschi asked the jury.

His closing submissions continue.