With the development of society and the improvement of material conditions, human beings are living longer and longer, the problem of old age has become a more prominent social problem, many problems of the elderly should be concerned and solved by society, the marriage and sexual problems of the elderly is one of the many important issues. A person’s life is only exceptionally tenacious under the role of sex, and the sexual activities of the elderly are often linked to life. The aging of the human body does not mean the aging of sex, and practice has proved that sexual activity can make the elderly maintain a young and healthy body, and can make the elderly get a second youth, so that they can live a long and healthy life. I. Sexual physiology and functional changes of the elderly The study of sexual physiology and functional changes of the elderly so far, there is no complete and systematic research data. However, it is generally believed that after people enter old age, there is a significant decline in the function of all organs of the body, due to the reduction in the secretion of endocrine hormones related to sexual activity, sexual desire is also declining, and some people have done research on the volume changes of testicles in middle-aged and elderly people, and found that the volume of testicles on the left and right sides of the elderly is reduced than that of middle-aged people. The normal or disorder of sexual function in old age is influenced by various factors including: natural living conditions, family status, social factors, ideology, traditional concepts, psychological quality, etc. Such as the influence of traditional cultural awareness, prejudice against the sexual behavior of the elderly, mandatory suppression of sexual requirements; interference by children, widowed and afraid to remarry, sexual desire is suppressed; fear of their original disease, afraid to have sex; husband and wife do not get along, lack of understanding and trust; lack of sexual knowledge, do not understand the relationship between sex and life, health. Therefore, the correct treatment of sex life of the elderly, so that the elderly know the importance of sex and health, for the elderly health care is of great significance. Second, the elderly have good sexuality is one of the important signs of physical health normal sex life of the elderly, not only can reduce the possibility of physical and mental diseases, and the prevention of cancer and a variety of gynecological diseases is also very beneficial. According to the research of West German medical experts, sex can promote the secretion of “beta-endorphin” in the body to enhance the vitality of macrophages and anti-interference, which can avoid and prevent the occurrence of certain cancers. The normal and satisfactory sex life of elderly couples can reduce the prevalence of prostate cancer in men and breast cancer in women. This is because after intercourse, the man’s prostate can be kept regularly open, blood circulation is improved, avoiding and reducing the inflammation of the prostate, hypertrophy and the occurrence of malignant tumors. A harmonious sex life and the pleasure of orgasm also helps to regulate the various hormones in a woman’s body, psychological balance and mental relaxation, thus reducing the incidence of breast cancer. In addition, male semen contains an important antibacterial protein comparable to penicillin – seminal cytoplasm, which can destroy staphylococci, streptococci and other pathogenic bacteria. Older women are prone to many gynecological diseases due to declining estrogen levels. A timely and reasonable sex life allows the husband’s semen to regularly moisten the vagina and play a beneficial bactericidal role, thus preventing and reducing the occurrence of many gynecological diseases. Sex is also a relaxing physical activity, the oxygen consumption between couples having sex is equivalent to climbing four flights of stairs, an easy walk. In addition to promoting the elderly blood circulation, lung capacity, the pelvis, limbs, joints, muscles spine, etc. also increased the whole body movement, also beneficial to health. There are many couples over 100 years old in the world, and all of them are loving couples. Single than those who are married, widowed than those who grow old together, divorced than those who do not have a high mortality rate, and men in particular. The reason for these differences is that going to a sexually active partner creates a sense of loneliness and isolation. The intimate and unparalleled marital relationship and sex of older couples is not replaced by others in the family. Many surveys have shown. Older men are more inclined to take the wife as the only partner. Third, the elderly should pay attention to the problems of sex life 1, to maintain psychological health: to master the necessary knowledge of sex, have a correct view of the couple’s sex life, have confidence in themselves, to prevent the decay of old age psychology, not affected by social prejudice. In this regard, the credo pursued should be: “This is a normal thing, we can do it.” 2, to insist on having a proper sex life: Some people think that, for the middle-aged and elderly, still keep sex will greatly affect the health, the actual situation is the opposite, because “not using it” will “lose it”. Many studies have proven that older women who do not have sex have a greater degree of vaginal atrophy than women of the same age who do have sex; men have a similar phenomenon. Men after the age of sixty, if they can continue to maintain a relatively regular and satisfactory sexual activity, can make energy, happy spirit; on the contrary, sparse sexual intercourse or sexual intercourse stop, can lead to congestive prostatitis and other diseases. A proper sex life helps to keep the brain young and prevent brain aging. The human hypothalamus and pituitary gland, specializing in the secretion of sex hormones, sexual activity to stimulate this part, so that the hormone secretion is good, have to promote blood circulation and all aspects of the metabolic effect. The frequency of sex for the elderly should be based on the health of both sides, good health can be more, poor health can be appropriate interval longer. In short, the elderly have the right and the potential to enjoy sex. We should remember a principle pointed out by a sex scientist in 1978: “One of the purposes of sex therapy is to help older people to be sexually satisfied. Not only does this have positive social implications, but it also enables older couples to experience the pleasures of later life without mental stress through further emotional interaction and increased intimacy and self-esteem.”