Sexually transmitted diseases is the abbreviation of sexually transmitted diseases, the modern concept refers to a group of systemic infectious diseases transmitted mainly through sexual contact. Conceptually, it is important to note a few points: 1. STDs are not a disease, but a group of diseases In the old concept, STDs, also known as “venereal diseases”, are a variety of systemic diseases transmitted through sexual intercourse with obvious damage to the reproductive organs, and usually include only five diseases, including syphilis, gonorrhea, chancre, lymphogranuloma venereum, and inguinal granulomas, which are also known as “classical STDs”. Diseases, which are also known as “classic STDs”, from the 1970s, STDs include a gradual increase in the number of diseases, in 1975 the World Health Organization (WHO) officially decided to use the name of sexually transmitted diseases (STDs) to replace the concept of STDs, STDs include more than 20 kinds of diseases. 2, STDs are a group of systemic diseases Although most STDs have obvious damage to the reproductive organs, but many STDs can affect the whole body of multiple systems and organs, and some even do not have obvious damage to the reproductive organs. So don’t think that STDs are only genital lesions. 3, STDs do not mean all diseases of the genitourinary system STDs are a group of infectious diseases, STDs affecting the genitourinary system is only a small part of all diseases of the genitourinary system. Do not put all the diseases of the genitourinary system are said to be sexually transmitted diseases. Some people have observed the genital area of the skin mucous membrane abnormalities of the dermatology and venereal disease outpatient clinic patients, found that more than half of the patients are non-stereotypes of damage. 4, STDs do not include sexual dysfunction Sexual dysfunction refers to the inability to carry out normal sexual intercourse activities or pregnancy and childbirth of a group of diseases, such as impotence, premature ejaculation, frigidity, infertility, preterm labor, sometimes Chinese medicine sexual dysfunction is categorized as a “sexually transmitted diseases”, but never referred to as sexually transmitted diseases here. Although venereal disease can cause sexual dysfunction, but venereal disease is a group of infectious diseases, does not include sexual dysfunction. 5, sexual contact does not only mean sexual intercourse Sexual intercourse generally refers to the penis into the vagina of a sexual contact behavior. Sexual contact capable of transmitting infectious diseases includes all close skin-to-skin contact between individuals, which may be normal, abnormal, pathological, homosexual, such as anal sex, oral sex, kissing and so on. 6, STDs are not all infected by sexual contact STDs are mainly transmitted directly through sexual contact, accounting for more than 95%, but there are still a small number of patients are in contact with secretions, blood-contaminated items and infected, that is, indirectly infected, including the same bed, the same bathtub, shared towels, clothing, towels, toilets, injecting needles, etc., which is referred to as the “innocent sexually transmitted diseases Some people call it “innocent STD”.