Other parents with experience with sibling experimentation?

We caught our just 14 year old daughter teaching her little sister (almost 10) how to kiss, and a little more. We didn't want to overreact, and were wondering how others have handled it, if you've had a similar experience.

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IM5688 · 61-69, M

When you say she was "teaching," what exactly do you mean?
Was she teaching her by explaining it to her or was she actually teaching it by doing it with her?
With explaining, I don't see a problem but IMO, actually being physical may cause problems for both girls in the future.