A Syrian-born airline pilot tricked a woman into having sex with him by saying intercourse could cure an infection, a court has heard.
Mr Sbano denies charges of rape and obtaining money by deception
Fadi Sbano, 38, faces allegations of rape by deception over his relationship with the teacher from Pembrokeshire.
The "treatment" allegedly occurred for nine months before the woman told her doctor.
Mr Sbano, from Harrow, London denies nine charges of rape and 11 of obtaining money by deception.
Huw Rees, prosecuting, told a jury at Swansea Crown Court that the pair met in 2000 while Mr Sbano was based at Gatwick and the woman was working at a school in Surrey.
Then he started playing tricks on her, Mr Rees said, by telling her he had stomach cancer and had just six months to live.
When she developed an infection, Mr Sbano told the woman he knew a gynaecologist who recommended a cream be applied through intercourse, the jury heard.
Mr Rees said the woman found the sessions "clinical," not at all erotic. She consented only because she believed it was a proper treatment.
"It began to dawn on her that he had devised this treatment in order to have sex with her on his terms," he said.
Mr Sbano continued to deceive the woman and persuaded her the cream was expensive, the court heard, so she gave him £400 and her mother handed over £5,500.
Mr Sbano also told both women he had to go to the United States for cancer treatment and the alleged victim's mother gave him a further £1,500, the jury heard.
After his arrest Mr Sbano denied telling anyone he had cancer and claimed the woman had invented the entire story about the "treatment".
The trial continues.