Princess Diana and Prince Charles
Princess Diana confessed that sex with Prince Charles was "odd." Pictured: Prince Charles and Princess Diana at Westminster Abbey, London, for a centenary service for the Royal College Of Music on Feb. 28, 1982. Getty Images/Fox Photos

Princess Diana previously admitted that sex with Prince Charles was "very odd."

In a video recorded between 1992 and 1993, the late Princess of Wales opened up to her tutor Peter Settlelen, and the two talked about the royal's married life. At the time, Princess Diana and Prince Charles had been together for 12 years, so they touched on their intimacy as a couple.

"Well there was [sex.] There was. There was. But it was odd, very odd," Princess Diana said (as quoted by Express). "But it was there then it fizzled out about seven years ago, six years ago, well seven, because Harry was 8."

"Instinct told me, it was just so odd. I don't know there was no requirement for it from his case," the People's Princess continued. "Sort of once every three weeks and I kept thinking. And then I followed a pattern, he used to see his lady once every three weeks before we got married."

Princess Diana was aware of Prince Charles and Camilla Parker Bowles' affair. In fact, she confessed that the Duchess of Cornwall broke her heart by calling on the phone when Prince Charles was about to leave for a five-week royal tour months before their royal wedding. Princess Diana received the call and opted to be nice, so she left the two on the phone.

Later that day, Princess Diana was photographed sobbing during Prince Charles’ departure. According to her, it was not due to the fact they would be separated but due to Camilla’s call.

Princess Diana also claimed that Camilla ruined their honeymoon by sending a present to Prince Charles. She confronted the future king, who insisted that nothing was wrong as it was from a friend. But Princess Diana was very jealous and they fought over it.

However, the Prince of Wales denied his affair with Camilla. According to Prince Charles, he tried to be faithful to Princess Diana.

Although Prince Charles appeared to be calm during the interview, according to body language expert, Judi James, his actions showed otherwise. The Prince of Wales actions were showing signs of annoyance, anxiety, impatience and guilt.