Brooks Nader and Gleb Savchenko didn’t leave it all on the dancefloor. 

Because according to the Sports Illustrated model’s sister Grace Ann Nader, the former couple—who struck up a romance while partnered on Dancing With the Stars in the fall—kept themselves occupied on set of the competition series with more than just rehearsals.

“I can tell you firsthand,” Grace Ann, 25, said during the May 12 episode of the Chicks In the Office podcast, “every time I visited Brooks’s trailer, the trailer was shaking every single time. I never wanted to go in there. I was always knocking.”

And Brooks, 28, didn’t exactly deny the TMI confession.

“The trailer thing was probably why we didn’t win,” she deadpanned. “What’s a girl to do? I was newly single.”

Indeed, amid her breakup from estranged husband Billy Haire, Brooks recalled asking producers for “the hottest, douchiest guy” as her dance partner—but to her surprise, her rebound turned into something much more.