What do you mean "backed up"? Like when a guy doesn't have sex? If so...we don't get "backed up" like that.
Symptoms from not having sex? There are none. A woman's body parts do not function like a man's so if you are referring to what I think you're referring to (***...for lack of a better term) a woman doesn't get "backed up" in that area.
Define "backed up".
What does that mean?