Growing up without sisters, one of the things we missed was being around a girl that was totally open with her brothers. Yes we had cousins, friends etc, but being a family is very different. (Going through the whole puberty thing now makes me glad I did miss part of it.)
One of the things we always debated was, do girls fart? I remember Pat insisting that girls don't.
One of my favorite shows is MythBusters. Apparently they did a show on this topic and were afraid to release it. But, since we have the Internet they couldn't hide it.
Of course with daughters I know the answer. So I think this is fake ;-)