"Surprise each other", please don't treat this interesting "humorous activity" as a cliche or a formalistic "fake trick". You try to do it, and it's not too late to evaluate it after seeing the effect. You will find that this kind of behavior, which contains deep respect and love, will not only bring a beautiful night, or intoxicating sexual life and other "one-off" effects, but also precipitate and condense, promote and sublimate the feelings of husband and wife, including sex.