When Bristol and Sarah Palin appeared on Oprah last week to talk about the 19-year-old's sex life, or lack thereof, Oprah seemed more than a little skeptical. Teen mom Bristol said she plans on not having sex until she gets married and thinks other young women should have the same goal. After Bristol declined Oprah's offer to retract her public abstinence vow, Oprah said: "I'm just wondering if that's a realistic goal." Oprah probably remembers having a similar conversation with Britney Spears a few years ago. You can watch that vintage interview below. Do you know anyone who remained celibate until marriage?