According to the News of the World, the hairdresser, who broke up with clothes salesman Jamie Butler two months before entering the house, is concerned that the X-rated video may be seen by the public.
"Rachael told us in her interview how much she enjoyed sex, and that she had never once been faithful to her boyfriends," a show insider told the paper.
"She's quite unashamed about it all, frankly, and doesn't seem to care who she tells. She said her biggest fear is the sex tape she made with a previous boyfriend getting out. She thinks he deleted it - but is seriously worried that it is floating around somewhere.
"And the fact she has now admitted to cheating on every one of her boyfriends means they could be looking for some payback."