You know, I don't mean to disrespect the spirit of the question, but if you're looking for such a person, shouldn't you yourself be past the immaturity stage? There is a forum specifically devoted to questions like this (which happens to be right about the listing for this forum), and it doesn't show a lot of intelligence when you either A) miss the other forum despite it's obvious placement/purpose or B) intentional ignore it.
P.S.
While I can not personally comment on the lovely lady herself, everything I've read about Ms. Gina Lee fits your requirements to the T.