Diseases that are transmitted primarily through sexual contact are commonly referred to as sexuallytransmitteddiseases (STDs), or “STDs”. Theoretically, all diseases that can be transmitted through sexual intercourse can be classified as STDs, so STDs currently include dozens of diseases. There are eight STDs that are legally monitored in China: syphilis, gonorrhea, non-gonococcal urethritis (cervicitis), condyloma acuminata, genital herpes, soft chancre, lymphogranuloma venereum, and AIDS. Sexually transmitted diseases, also known as “STDs”, are a group of infectious diseases that transmit pathogens mainly through sexual contact. It is developed on the basis of the original “classical venereal diseases” (venerealdiseases). The so-called “classical STDs” include syphilis, gonorrhea, soft chancre and lymphogranuloma venerealis. With the diversification of sexual behavior, the number of diseases transmitted by sexual contact has increased. The development of microbiological diagnostic techniques has also led to a deeper understanding of the pathogens involved. The incidence of these diseases is much higher than that of “sexually transmitted diseases”, and the severity of their symptoms (such as the high mortality rate of AIDS) is less than that of “sexually transmitted diseases”. In order to strengthen the research and treatment of STDs and to find a common way to prevent them, the World Health Organization revised the original concept of “STDs” in 1975 and replaced it with the term “sexually transmitted diseases” (STDs). According to the different pathogens, STDs are classified as: 1. viral diseases (genital herpes, AIDS, condyloma acuminata, molluscum contagiosum, viral hepatitis). 2. 2. Bacterial diseases (gonorrhea, soft chancre, inguinal granuloma). 3.Fungal diseases (candidiasis, ringworm). 4. Other pathogenic microbial diseases (syphilis, lymphogranuloma venereum). 5. Parasitic diseases (trichomoniasis, scabies, lice). 6. Those with unknown causative agents (non-gonococcal urethritis, non-specific vaginitis) have more than 20 diseases in total. The prevalence in adults is estimated to be 5-10%. Their common feature is transmission through sexual contact, but also through non-sexual contact infection, most of them have genital symptoms. They are co-infected. There is no specific treatment for the more dangerous of them, such as AIDS and genital herpes, so prevention is emphasized first. We should widely and correctly publicize the danger of STDs, cut off their transmission channels (such as using barrier contraceptive methods during sexual intercourse, avoiding transfusion and other external blood into the body, changing the way of sexual intercourse that may transmit STDs, etc.), controlling the source of infection (such as quarantine, disinfection, isolation, etc.), timely preventive medication, etc. At the same time, due to the danger of the disease and the special nature of the transmission method, it often causes huge psychological problems to the patients and their family members (especially their partners), such as STD phobia and STD hypochondria, etc. The primary disease should be actively treated and attention should be paid to psychosexual counseling and treatment.