What would you do if you found out your 16-year old sister was having sex?

Sivapoppasupamon
I recently accidentally caught my sister having sex with her boyfriend one night when my parents were away and I was home for spring break. I know she's pretty responsible for her age, but I personally feel that 16 is a little young for her to be having sex. My sister and I are very close, but I'm not really comfortable talking to her about this particular subject. Other than telling her boyfriend to "get the-f off my sister" and throwing him out of the house -- I was wondering what else I can do as a big brother.

I don't really want her to get her in trouble with the rents, but at the same time I think they should keep an extra eye on her, and maybe even knock some more sense into her. Should I tell my parents about the incident, and risk betraying my sisters trust, or should I just tell her to cut the crap and pray that she'll make the right choice?
What would you do if you found out your 16-year old sister was having sex?
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