Katrine Trolle said she had a threesome with Tommy Sheridan and his brother-in-law Tommy Sheridan had three-in-a-bed sex with a married member of the Scottish Socialist Party (SSP) and his brother-in-law, a court has heard.
Katrine Trolle, 36, also told the High Court in Glasgow that she had sex with Mr Sheridan at his family home while his wife attended a Christmas party.
Mr Sheridan and his wife Gail, both 46, are on trial accused of perjury.
They deny lying during his successful defamation case against the News of the World in 2006.
“As we drove over to his brother-in-law’s house, it slowly dawned on me that all three of us were going to have sexual intercourse”
Katrine Trolle Witness
Mr Sheridan won £200,000 in damages after the newspaper printed allegations about his private life, claiming he was an adulterer who had visited a swingers club.
After a police investigation, Mr and Mrs Sheridan were charged with perjury.
The indictment against Mr Sheridan contains the charge that he had lied about having sexual relations with Ms Trolle during his defamation case at the Court of Session in Edinburgh.
Ms Trolle, 36, who is originally from Denmark but moved to Scotland in 1996, told the trial she had slept with Mr Sheridan at least twice.
She said the former MSP had initially been “quite interested” in Danish “liberal values on pornography and sex”.
Ms Trolle told the court they first had sex during the SSP’s campaign for the Anniesland by-election.
She said: “While we were leafleting we had been flirting quite a bit and he asked me if I would come and see him.
“Obviously, I agreed and he came to pick me up a little bit away from where I was staying.
“I was staying with my then mother-in-law and it would have looked suspicious.
“He picked me up and we went to his house. I think I had a glass of wine and without much further ado we went up to the bedroom and had sex.”
Ms Trolle told the court that shortly afterwards, Gail Sheridan had called her husband and asked her to pick her up from a Christmas party.
She said: “We quickly got dressed and he drove me home so he could pick up Gail.”
Ms Trolle said she next encountered Mr Sheridan “many months” later, when he called her and asked her to come to Glasgow.
“I was getting undressed, or Tommy was helping me to get undressed, when Andy appeared. We spent most of the night having sexual intercourse”
Katrine Trolle Wintess
She said she got the bus from Aberdeen and he met her at the bus station, before taking her to his brother-in-law Andrew McFarlane’s house in Cardonald.
She said: “He hadn’t actually said we were going to his brother-in-law’s house. I was thinking I was going to see him.
“As we drove over to his brother-in-law’s house, it slowly dawned on me that all three of us were going to have sexual intercourse.
“We arrived and Andy opened a bottle of wine so he and I could have a glass of wine. Tommy went upstairs and not long after I went up there as well.
“I was getting undressed, or Tommy was helping me to get undressed, when Andy appeared. We spent most of the night having sexual intercourse.”
It is alleged that Mr Sheridan made false statements as a witness in his defamation action against the News of the World on 21 July 2006.
He also denies another charge of attempting to persuade a witness to commit perjury shortly before the 23-day legal action got under way.
Mrs Sheridan denies making false statements on 31 July 2006, after being sworn in as a witness in the civil jury trial at the Court of Session in Edinburgh.
The trial is due to last between two and three months and is expected to become the longest perjury case in Scottish legal history.
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