Maybe I am just being very jaded about this, but I do not put that much time and thought into what I consider fan service. For me it is plain and simple: EYE CANDY! Show me a shirt open, partly undressed bishounon, some hair flowing in the wind (of course I do have this thing about males with long hair anyway...) A bit/hint of sexual situations.... as long as it is in good taste ... that is fan service to me.
Maybe I am just getting too old for all that kind of thought, but I don't think about who I want to have a relationship with or who is going to be a loyal mate and so forth. Qualities of that caliber make for wonderful stories that can move you and make an anime so much more than most live action films can capture. But if we are going to talk about fan service then that is something that is completely visual and a bit carnal in nature and the more thought you put into it, the less effective it becomes. Some things you just have to enjoy with out over thinking them.
.... Just my own twisted little opinion on the subject.
