"So, I've been thinking about freezing my eggs," the 38-year-old reality star says in the clip.
"Are you serious?" Kim, 37, responds. "You want another kid?"
"What if I do though? I don't know what I want," Kourtney explains. "What if I want a kid in the next ten years? Wouldn't you rather have the insurance sitting there?"
Her sisters tried -- mostly unsuccessfully -- to figure out whom she was thinking of as the father.
"Who would you have a kid with?" Kim asks.
"I don't know," Kourtney says, smiling.
"She does -- look at that smile!" Khloe, 33, says.
"Wouldn't you just say, ‘Hey, Scott, give me your sperm,'" Kim asks, referring to Kourtney's ex-boyfriend, Scott Disick, with whom Kourtney shares her three children, 8-year-old son Mason, 5-year-old daughter Penelope and 3-year-old son Reign. "And they take it in a turkey baster and they stick it up you and [squeeze]."