Wow, people. Who says all teenagers don't think about consequences? I was thinking the same thing as her brother, but I've thought about that sort of thing all the time.
The generalizations of those who think they are superior are absolutely infuriating.
I may only be thirteen, and you may think I'm stupid, but I just thought that I should put that out there. Not all teenagers who want to have sex are absolutely stupid like you think they are.

On the subject, I've got to say that I think that what you did was absolutely wrong. It's his little place for him to not have to deal with people that know him in real life getting to that sort of information. Sure, a few may know, but that's because he might want them to.
Invasions of privacy = bad = fail.
Naughty sister D=<