How often a 40-year-old couple have sex, according to the body to decide, there is no absolute normal indicators. 40 years old has belonged to the middle age stage, because of work, family and other aspects may make the body and mind more tired, sexual function will gradually decline, the frequency of sexual life should also be combined with their own physical state, as long as both husband and wife can be satisfied with it, do not have to deliberately pursue the so-called normal number of sexual life. 40-year-old couples want to improve sexual function, can be appropriate exercise in daily life, at the same time more supplemental nutrients, so that not only can make the body more healthy, but also can make the sexual function improved. If there is any discomfort during sex, it is recommended to have a detailed examination in a regular hospital and follow the doctor’s instructions for treatment.