Update 2pm: Tammy Kingdon has given emotional testimony as she described taking part in orgies and being “king hit” at a Christmas day family gathering which her children were also attending.

Ms Kingdon is giving evidence in the District Court trial of her former partner, Finks motorcycle club member Troy Mercanti, who is fighting five assault charges stemming from the alleged domestic violence.

Mr Mercanti’s lawyer, Colin Lovitt, is arguing that the allegations made by Ms Kingdon to police were fabricated in a bid to aid her decision to leave the relationship with the couple’s two sons.

This morning, Ms Kingdon continued giving evidence via videolink.

The 36-year-old wiped away tears as she told the court how she continued to go back to him for the sake of their two sons.

When Mercanti was in jail for 16 months, she visited him twice a week and called him every day, she said.

She broke down as she began to describe incident on Christmas Day 2006 which saw her allegedly beaten after she questioned Mr Mercanti about where he had been for several days.

She said Mr Mercanti - who had been released from a stint in custody just before the incident - had been gone for about five days when he arrived mid-morning after their sons had opened their presents.

Ms Kingdon said Mercanti “seemed okay” but appeared to be lacking sleep and had the smell of alcohol on him, so she asked where he had been.

"I was questioning as to why he didn’t come home for the kids’ first Christmas that he had been out of prison," the 36-year-old said.

“He was acting quite sweet and then he closed the bedroom door,” she said.

Ms Kingdon said Mr Mercanti "started belting, hitting on me... like punching a man".

Mercanti struck Ms Kingdon to the sides of her head and body, and kicked her legs and side of her breast when she was on the floor, she said.

She told the jury she had pleaded with him to stop and pointed out that the children were in the home but he had continued the alleged assault even as she tried to fix herself up in the ensuite bathroom.

The entire assault lasted about 10 minutes and Ms Kingdon said and she knew she had to get out of the house.

“I felt like I’d been hit by a truck,” she said.

But later that day when she attended a family gathering at Mr Mercanti’s parents’ home with her sons there had been another confrontation during which he allegedly punched her with a "king-hit" to the mouth in front of relatives.

"One of my teeth came out on to the floor and the other two were just hanging out of my mouth," she said. "I was just in shock. I could feel with my tongue there was nothing there... I couldn’t believe it."

Ms Kingdon said Mr Mercanti’s brother Jason had helped look for her missing tooth and that his mother had reassured children playing on the nearby staircase that everything was OK before driving her to a hospital emergency department.

She said she had told the doctor she fell down some stairs because that was the lie they told the children.

Mercanti was jailed again in December 2008 and when he was released they took a family trip to Queensland that was “amazing”.

“It was the best the relationship had ever been,” Ms Kingdon said.

She said shortly after, the couple discussed allowing other people into their sexual lives because she wanted to keep him happy.

She said they attempted a foursome with another couple in a spa but she was not ready so she watched him with another woman instead, which left her feeling hurt.

At another party she said a group that included that same couple and two other women took some drugs and participated in a “sex session”.

Mercanti’s defence lawyer has argued the couple were addicted to sex and “keen as mustard” for threesomes.

The trial continues.

The West Australian

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