*The days of Barbara Walters asking “If you were a tree, what kind of tree would you be?” are long gone.

In an interview with President Obama and first lady Michelle Obama, the 83-year-old journalist had no qualms about prying into their sex life at the White House.

Walters asked them how they “keep the fire going in their marriage,” making for a bit of an awkward exchange.

“We’ve been married now 20 years, and like every marriage, I think you have your ups and your downs,” the president said after a surprised chuckle. “But if you work through the tough times, the respect and love that you feel deepens.”

The first lady added that they like to laugh a lot — which led Walters to assert that Michelle was the funnier of the two. [Watch the clip below.]

The interview, which ran Wednesday on ABC’s “Nightline,” was originally scheduled to run as a Barbara Walters special but was preempted by coverage of the Newtown shootings.