Camilla Parker had apparently allured Prince Charles to take revenge on her then cheating boyfriend and later husband Andrew Parker-Bowles, according to leading royal biographer, Penny Junor. British media is full of buzz on how Bowles cheated on Camilla with Princess Anne that triggered the Duchess of Cornwall to take revenge.
"Junor went on to claim that as a form of revenge – or 'tit-for-tat' as she describes it in her latest book – Camilla enjoyed her first 'fling' with Prince Charles in the early 1970s," a report on Mail Online stated. The author further claimed that Camilla shared an intimate bond with the Prince in 1971 to take revenge on her husband.
"When [Camilla] was introduced to Charles, he thought she was pretty special and he thought she was a bit of all right. And she thought, 'Andrew is at the moment off with Princess Anne; I'll teach him a lesson'; so she had a fling with Charles," The Telegraph quoted Junor at the Henley Literary Festival.
Later in 1973, Camilla married Bowles but he continued to play around—eventually triggering Camilla to resume her affair with Charles which led to the Prince's separation with Princess Diana. Affairs and flings are nothing new among the upper-class niche rich. Indeed, there is a famous story of how Lady Diana confronted Charles' affair with Camilla.
"Well, I refuse to be the only Prince of Wales who never had a mistress," Charles reportedly had said.
That seems to sum up everything!