John F Kennedy's numerous rumored affairs are arguably as much a part of the Camelot legend as his presidency, his alleged mafia connections and his subsequent assassination.

But JFK's twisted romantic life might have turned about so very different had his father, the fiercely controlling patriarch Joe Kennedy, allowed his charming, quietly intelligent middle son to marry his first love, Inga Arvad, a woman Joe referred to as a 'Nazi b***h.'

In the new book JFK: Public, Private, Secret, author J Randy Taraborrelli claims that JFK never truly got over the heartbreak and being forced to split from Arvad - and held it against his father until the day he died.

The young Jack Kennedy met Inga Arvad in October 1941. At 28, the Danish journalist was four years older than him and already twice married. But their attraction was electric, writes Taraborrelli.

'He had charm that makes the birds come out of the trees,' the book reports that Arvad wrote of Jack, 'natural, engaging, ambitious, warm, and when he walked into a room you knew he was there, not pushing, not domineering but exuding animal magnetism.'