Kaleido Star is great, from what I recall. In terms of fanservice, this series will be fine.
I think you and your sister ought to check out Ouran High School Host Club and Fruits Basket. They are both pretty funny and quite acceptable for those that aren't into pervy things.
It's tough to come up with a show that is dark and not dirty. Most of what I can come up with has elements that would fall under both (to many people). My favorite "dark" anime titles are Elfen Leid and When They Cry (Higurashi No Naku Koro Ni). As I recall, neither have that much in terms of pervy jokes. However, the first does have some nudity (quite a bit in the first few minutes of the first episode, in fact) and there is an episode in it that is quite pervertedly sick; however, the idea of the series is to sicken you in certain places. As for the second, I don't recall too much in terms of perverted jokes. What I do recall is a brief story arc that involves one of the main female characters having been adopted and the man raising her has said that he plans on marrying her when she's an adult, and the main character thinking that a friend of his is working somewhere as a waitress and is in a "sexy" uniform. (Personally, I thought the outfit looked kind of funny, but the character was attractive). It didn't last long, because the focus was on introducing a new character.
