Is It Appropriate for My Girlfriend to Discuss Sex With Her 14-Year-Old Sister?

My girlfriend is 22, and we started dating when she was 19 while I was 36. She is very close to her 14-year-old sister, and they spend a lot of time together. What makes me uncomfortable is that my girlfriend discusses sex, intimacy, romance and men around her sister. I have told her that I think some of those conversations may be inappropriate for a 14-year-old. She believes she is the best person to teach her sister about these topics. Am I overreacting, or can this be a healthy form of age-appropriate sex education?

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