JFK's shockingly callous 5-word response when Jackie had a STILLBIRTH - and all the other stunning revelations in MAUREEN CALLAHAN's new book

An explosive new book by DailyMail.com columnist Maureen Callahan exposes the secrets of President John F. Kennedy and his wife Jackie's tumultuous marriage.

In a major series starting in the Mail today, 'Ask Not: The Kennedys and the Women They Destroyed' lifts the lid on the famed American family's scandalous past.

The first exclusive extract opens with a visceral account of the moment JFK was assassinated on November 22, 1963, before detailing his many extramarital affairs, the agony of Jackie's miscarriages and lost babies, and the truth about their sex life.

Here — from under-aged mistresses, to sexually transmitted diseases, and orgies in the White House and the Mediterranean — we detail the ten most shocking revelations:

1.

Following the assassination, Jackie spent her final moments alone with JFK's corpse at Parkland Memorial Hospital, Dallas, intimately kissing his entire naked body: 'his mouth, his chest, his leg, his penis.'

2.

When JFK learned that Jackie had suffered a third-trimester stillbirth on August 23, 1956 – a daughter she named Arabella – he refused to return home from a holiday with 'starlets and bikini babes' in the South of France.

'What's done is done. The baby is lost,' he callously told his brother Bobby on the phone.

3. 

Jackie and JFK had sex the night before his death. They were hoping to conceive again after their son, Patrick, died just 39 hours after birth in August. But, on the morning of his assassination, she got her period.

4. 

JFK 'almost certainly' infected Jackie with multiple sexually transmitted diseases — including the asymptomatic chlamydia that likely caused her fertility issues and made her unable to carry so many pregnancies to term.

5.

Toying with the idea of divorce, Jackie struck a stunning deal with JFK's father Joe. 

He agreed to pay her $1 million if she stayed in the marriage – 'and millions more if Jack ever gave her a sexually transmitted disease again.'

6.

JFK sent a depressed Jackie to a mental hospital for the elite, Valleyhead in Massachusetts, in 1953. There she received three rounds of electroshock therapy in just one week. 

The treatment 'made her shake so violently that her bones sounded as if they were breaking,' Callahan reveals.

7.

Jackie knew about JFK's infamous 'pool parties' — which were held almost daily in the White House. 

The parties were often attended by his brothers, Ted and Bobby, as well as a host of young female staffers.

8.

19-year-old White House secretarial intern Mimi Beardsley lost her virginity to JFK four days after starting her position. 

JFK 'got her drunk', Callahan reveals, and then had sex with her in the bed that he shared with his wife. Beardsley and JFK had an 18-month-long affair between 1962 and 1963.

9.

JFK impregnated a 15-year-old babysitter back when he was senator, which Jackie knew about. In fact, so rampant were his infidelities, that Jackie suspected JFK had slept with her own sister, Lee Radziwill.

10.

Despite this 'high libido', JFK was terrible in bed. Jackie herself said: 'He just goes too fast and falls asleep.'

Many of his lovers were similarly dissatisfied. 'No kissing, no build-up… no fun. He never lasted longer than three minutes and didn't seem to enjoy sex,' Callahan writes.