As I said it also depends on story, Rave Master also have fanservice, but in Fairy Tail fanservice was above plot. Like when mangaka put fanservice as main factor that will lead manga...than it's end. I'm not teen so if I see another vagina glimps in anime it will work on me in different way. Like if this anime in about showing girls genitiles, for what auditory this anime was created, or manga was written.?! Obvious this will only made me doubt in it even more. But then again fanservice was also part of Guren Lagan, still I loved that cteators never used fanservice on Simons beloved Nia, and made her like most beatiful female character, while Yoko was used only for fanservice at the begining. So even that fanservice played big role...Simon was jealous for his brother, that he have Yoko, but in the end Simon surpassed his older brother in everything, even his beloved was litteraly different than anyone else. So yeah, in Guren Lagan was not only Fanservive, but even love story. It was tail of growing man, that from small scared kid became a man, who saw everything in his life.
So in the end main question will be for what purpose fanservice used in manga. And if it's main idea to please spermatic teens....than it will actually could make me less enjoying this story. So yeah, as I said all depends ...
