According to a new biography authored by a friend of Frank Sinatra, Marilyn Monroe was “enamored” of President John F. Kennedy but had no intention of ending his marriage to Jackie.

According to Irish Central, Tony Oppedisano said in his latest book, “Sinatra and Me: In the Wee Small Hours,” that Monroe “looked up to” JFK but that there was “only so far that even she would go.”

“She wouldn’t let it go that far, even if she felt that deeply,” he said, adding that Monroe “wasn’t about to break up [the president’s] marriage.”

“It was obviously a sexual thing, and I would expect that there were feelings on her side,” Oppedisano said of Monroe’s connection with the president.

“Just taking a look at the footage of her singing her ‘Happy Birthday,’ that speaks for itself,” he remarked, referring to a famous May 1962 event.

“It’s not like she was in love with” the president, adds Oppedisano, but she “looked up to him.”

“She was enamored of him… She respected him; she admired him. She loved what he was doing with the country, and then to have a physical relationship with him, she found him attractive and vice versa,” he told People Magazine. Despite her affections for Kennedy, she never claimed to be in love with him, believing that having an affair with a “married man and a father” — let alone the president of the United States — and breaking up his marriage would be against her principles and ethics.

While travelling in California with Sinatra, Oppedisano recalls the vocalist pointing out a home where Monroe and the president would “slap and tickle.”

Another Kennedy was in the picture: the president’s younger brother, who was serving as his attorney general at the time.

From left: Robert F. Kennedy, Marilyn Monroe, and John F. Kennedy
CREDIT: CEFCIL STOUGHTON/THE LIFE PICTURE COLLECTION/GETTY

JFK “passed off” Monroe to his brother when he became bored of the romance, according to Monroe historian Jason Spada.

Although, according to Spada, “it was pretty clear that Marilyn had had sexual relations with both Bobby and Jack.”

Oppedisano, on the other hand, remembers it a little differently: “When things phased out with Jack, that’s when she picked up with Bobby, and I don’t think it lasted anywhere near as long or was as deep as it was with JFK. Bobby was a different mentality all together.”