Former real estate agent Gerard Baden-Clay has told his murder trial three affairs he had were purely physical and he never intended to leave his wife.

Murder accused Gerard Baden-Clay wept in court for a second day as he revealed details of his multiple affairs, saying he never intended to leave his wife and only wanted sex.

The 43-year-old also used a highlighter to demonstrate how twice he cut himself shaving the morning his wife Allison vanished on April 20, 2012.

Baden-Clay returned to the witness box in the Brisbane Supreme Court on Monday where he continued to answer questions from his barrister.

The former real estate agent said that by 2005 he and his wife were leading separate lives.

While his career in real estate was taking off, Allison was on anti-depressants, had gained weight and lost her libido.

“She was just like a sort of a blurrier image of herself,” he said, his voice cracking with emotion.

Allison fell pregnant after he reluctantly agreed to a third child and Baden-Clay admitted that during this time, in 2006, he had a one-month affair with a former colleague.

“I just wanted sex,” he sobbed, wiping his eyes with a handkerchief.

“Allison and I hadn’t had any sort of physical intimacy for years. It’s not an excuse but that’s why.” Two years later he began another affair with a sales agent at his practice named Toni McHugh.

“It started one night in the office when we were both working back,” he said.

“Then on a couple of occasions we actually met up and had a tryst, I suppose you’d describe it, in my car.”

Baden-Clay said while it was “purely for the physical intimacy”, the “volatile” Ms McHugh wanted him to divorce Allison, but he refused.

He was afraid she’d damage the business and said he told his business partners “there were occasions when I was effectively sleeping with Toni for the sake of the business”.

He also admitted to a one-off liaison with an old flame at a Sydney conference.

Baden-Clay said when Allison discovered his affair with McHugh in September 2011 he vowed to end it but rekindled the relationship three months later.

He said emails he sent Ms McHugh in April 2012 saying he loved her and in which he vowed to leave his wife were meaningless and he was trying to make her “go away”.

Baden-Clay said when he went to sleep on April 19, 2012 Allison was watching TV and when he woke up she was gone.

He used a highlighter to demonstrate how he cut “two fairly long slices off my face” while shaving in a rush that morning.

“I pulled down and flicked up … and that’s when I cut myself,” he told the court.

He said it “hurt a lot” and he “had a bit of an issue shaving around those cuts obviously and cut myself again”.

Allison Baden-Clay’s body was found on a creek bank at Anstead on April 30, 2012, 10 days after her husband reported her missing.

He has pleaded not guilty to murder.

The trial continues.