Horrible films can be extremely unpleasant to watch. Even So Bad, It's Good
films can be a pain to sit through. But sometimes, there is a little bit of comfort: Since Hollywood has so many gorgeous actors, maybe one of the characters is played by someone extremely sexy. Or maybe there's a really sexy scene. Whatever the reason, the film is made at least a little bit more tolerable by the presence of Fanservice.
Not the same as Best Remembered for the Fanservice, which could apply to any type of film. This is for bad films made a little enjoyable by Fanservice.