Kate was shown voicing concern to Dr. Pepper about how Luke -- who wanted to keep their sex life a secret -- tended to shut down and get quiet after every sexual encounter.
Recalling their first time together in particular, Kate told Dr. Pepper, "I just kind of thought, 'It's our honeymoon, we're married, I like you so far -- and so I just asked and we did, and then it turned out he didn't want to and seemed unhappy about it. And I just felt terrible."
"I'm shocked by this," Unfiltered host Jamie Otis told Luke. "You and Kate have been having sex since the honeymoon?!"
"Since the honeymoon," Luke confirmed.
"And I didn't want to share that with everyone, but you know, here we are because the truth always comes out eventually. Back then, I was naive and just like, you know, 'Let's hide it.'"
Luke and Kate have discussed in detail on Unfiltered the moment when Luke said he felt "repulsed" and "dead inside" after the pair's first real post-wedding kiss on their honeymoon.
But it turns out, the couple actually had sex that night.
"Yeah that wasn't [about] a kiss obviously now," Luke said with a laugh.
The latest episode of the series featured the couples attempting to navigate their relationships and deepen their bonds with less than one week remaining until "Decision Day," when they must decide whether to stay married or get divorced.