The father of two didn't give up easily, and he sent his girlfriend a crude joke via text message. "Knock knock, who's there?" he asked Kourtney. "It's my penis knocking on your back door." Khloe then suggested that her sister give Disick a taste of his own medicine by asking him to try it first.
When Kourtney presented the idea to Disick, he dismissed the idea. "This is not a two-way street!" he said. He later relented, telling his partner, "I'm going to call your bluff."
Later in the episode, Kourtney snuck up on her boyfriend -- while wearing a strap-on dildo over her pajamas! She then chased Disick around the house before he agreed to never bother her about trying anal sex again. "I think I may have to become celibate after this," Disick said.
Keeping Up With the Kardashians airs Sundays at 9 p.m. EST on the E! network.