But, in private, the president has revealed some very risqué secrets about why their bond is so strong, much to his wife's annoyance.
He infuriates wife Jill by joking that the key to their 47-year marriage is 'good sex'.
His racy comment has been revealed for the first time by Katie Rogers in her forthcoming book 'American Woman: The Transformation of the Modern First Lady, from Hillary Clinton to Jill Biden,' in an exclusive excerpt obtained by DailyMail.com.
The president gives that marital advice to aides 'much to his wife's chagrin,' reports Rogers, a longtime White House reporter for the New York Times.
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