The existence of a sex tape, along with other revelations on Edwards' affair and allegations of an expensive cover-up of Hunter's pregnancy, came to light in Young's new tell-all book, "The Politician."
Hunter said she made and hid a videotape that "depicted matters of a very private and personal nature" in or around September 2006, according to an affidavit filed Jan. 28, 2009.
Young said the woman in the tape was noticeably pregnant. While the woman's face is not seen in the video, Cheri Young said the woman is wearing a bracelet and a thumb ring typically worn by Hunter. Young, who had worked for Edwards since his 1998 Senate win, said he was absolutely sure it was Edwards in the tape.
In a second affidavit, submitted after Young had handed over copies of the tape to the court, Hunter said that after viewing the tape, she was able to recall when and where the tape was made and that she was not pregnant at the time. She called the Youngs' public assertions to the contrary lies.
Hunter claimed the video was left in a hatbox where she kept personal items, like her passport, in a house that the Youngs rented for her. The Youngs said the video was found in a box of trash in their own home after Hunter stayed with them for several weeks in 2007.
Young told ABC News that he'd been offered a "gigantic" amount of money to sell the tape.
Hunter also has filed suit against the Youngs to seek damages for invasion of privacy.
The Associated Press contributed to this report.