Talk about a throwback!
In this clip from the early days of Keeping Up With the Kardashians, Kylie Jenner asks Khloe Kardashian questions about getting her period. Since Kendall Jenner is closer to "becoming a woman," Khloé decides to make a fun little class out of it.
"The time has come to talk to Kendall. I could just tell Kendall is so uncomfortable," Khloé explains. Kendall doesn't even want to make eye contact with Khloé when she's talking about how everything works!
She adds, "Kendall is squirming and just kind of sinking back into the couch."