A 32-year-old woman has accused a wealthy couple of forcing her to sleep with them in exchange for forgiveness of a 500,000-baht debt. But the husband claims the woman had an affair with his wife.

Lawyer Phaisarn Ruangrit took the woman to the complaint centre at the Central Investigation Bureau (CIB) to seek legal action.

According to the lawyer, the victim worked at a logistics firm and met the wife of the company’s owner. They became friends. Whenever the victim had financial trouble, the woman helped her with loans that eventually totalled 500,000 baht.

The owner of the firm later learned of the arrangement and got upset, said Mr Phaisarn. The husband accused the woman of having an affair with his wife. He forced her to enter into a “contract” that she must agree to sleep with them in a threesome in exchange for forgiveness of the debt, according to the lawyer. If she refused, they threatened to sue her for 10 million baht, he added.

Fearing for her future, the woman agreed to the demand, the lawyer said. Several sexual encounters followed, but when the woman tried to end the arrangement she faced further intimidation.

The woman finally sought help from Mr Phaisarn, who examined the contract and said it went against morality and the law.