“The fact that I was being desired by the most famous and powerful man in America only amplified my feelings to the point where resistance was out of the question. That’s why I didn’t say no to the president. It’s the best answer I can give.”

In her explosive new tell-all, “Once Upon a Secret: My Affair with President John F. Kennedy and Its Aftermath,” Alford, now a 69-year-old grandmother and retired New York City church administrator, sets the record straight in searingly candid detail.

In the summer of 1962, Alford was a slender, golden-haired 19-year-old debutante whose finishing-school polish and blueblood connections had landed her a job in the White House press office.