"He could be gracious and respectful of those with power and influence," Sabato, director of the Center for Politics at the University of Virginia, told AFP.
In the White House, she championed the arts and culture, and presided over lavish state functions, while tending to the couple's young children Caroline and his son, John Jr, also known as John-John.
In the hours after Kennedy was killed, Jackie -- who was sitting next to him in the open-top presidential limousine in Dallas -- famously refused to change out of the pink Chanel suit spattered with his blood.
"I want them to see what they have done to Jack," she said.
She died in 1994 at the age of 64, with the John F. Kennedy Presidential Library and Museum in Boston remembering her as a selfless woman of duty.
"With a deep sense of devotion to her family and country, she dedicated herself to raising her children and to making the world a better place through art, literature, and a respect for history and public service," reads her profile on its website.
But, while the Kennedys projected a public image of the quintessential modern American family, the president privately surrounded himself with paramours aplenty.
The presidential birthday boy made no effort to conceal his delight.
Jackie knew of the liaison, [ as well as the other women]. Including Judith Campbell Exner, whose claim of a steamy two-year affair with Kennedy -- coinciding with a relationship with a Chicago underworld kingpin -- is deemed credible by historians.
Or Mimi Beardsley, a 19-year-old White House intern when Kennedy wooed her into an affair that lasted 18 months. She was a virgin, she said, when they first made love on Jackie's bed; later the two would race rubber duckies in the presidential bath tub.
No-one knows how many prostitutes Kennedy hired, but there were enough for his bodyguards to worry that he might fall victim to espionage or blackmail, at a time when the United States and the Soviet Union stood on the brink of nuclear war.
"He had a tendency to surround himself with ladies sometimes who were a little worrisome," said one Secret Service agent, Anthony Sherman, in an ABC television documentary in 1997.
"This was reckless to the extreme," Sabato told AFP.
"JFK risked his presidency and family over and over... Almost certainly, foreign intelligence agencies had some knowledge of this pattern of behavior."