Princess Diana once described her sex life with Prince Charles as "very odd."

The Princess of Wales said that when they were together, Charles would often only ask her to have sex every couple of weeks. She said that eventually, any intimacy between them "fizzled out." Diana spoke to speech coach Peter Settelen in 1992 and 1993, when she and Charles had been together for 12 years. She told him:

“Well, there was (sex). There was. There was. But it was odd, very odd. “But it was there then it fizzled out about seven years ago, six years ago, well seven, because Harry was eight."

Diana went on to say that her instincts told her that the situation was slightly abnormal. She said that Charles would ask her for sex every couple of weeks and that their intimacy became a "pattern." “Instinct told me, it was just so odd," she said. "I don’t know - there was no requirement for it from his case." “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.” Diana later revealed that she discovered Charles was cheating on her with Camilla Barker Bowles before he left the UK for a five week tour. She said that she had been speaking to him about the trip when Camilla phoned his study. “I was in his study talking to him about his trip," she said. "The telephone rang, it was Camilla. Just before he was going for five weeks. “So I thought, ‘Shall I be nice or shall I just sit here?’ So I thought I’d be nice, so I left them to it and it just broke my heart.”