If you found out your minor sibling was having sex, what would you do?

RJGraveyTrain
This was inspired by an anonymous question where a guy found his 12 year old sister apparently engaging in oral with another girl her age. I almost always assume these posts are fantasies made up by pervs but this one actually sounded sincere. The question was essentially what he should do.


It really made me think what I would do in such a situation. I think it would largely depend on their age - so let's just say that your sibling is below the age of fifteen and you discover them engaging in some form of sexual activity, doesn't have to be specific. How do you, as the older sibling, go about handling that situation?


Bonus question: would the gender of the sibling have an effect on how you feel about the situation? I know some people almost expect boys to have sex young while some view it as more dangerous if the individual is a girl.
If you found out your minor sibling was having sex, what would you do?
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