(sorry again for bumping an old topic)
i don't think she mentioned being jealous at all. She simply didn't know anything about it and wanted more information. I would be moderately freaked out if I didn't understand what the whole concept was about if I had just discovered it.
Even within religion, it's not always looked on as a bad thing. James dobson practically endorses it in a few of his books, so not all people are of the opinion that anyone who does it is going to hell.
also, women don't always necessarily put anything inside their vagina... I might venture so far as to say that a large percentage don't.