Sexually transmitted diseases (STDs), also known as STBs, are infectious diseases that are primarily transmitted through sexual contact, similar sexual activities, and indirect contact. These diseases can not only cause lesions in the urinary and reproductive organs but also invade the corresponding lymph nodes through the local lymphatic system, and potentially spread hematogenously to major tissues and organs throughout the body. STDs significantly harm the physical and mental health of patients, impacting the individual's family and society immensely. Over 95% of STDs are transmitted through sexual activity, with other similar sexual behaviors, such as oral sex, anal sex, masturbation, kissing, touching, etc., also increasing the risk of infection. Indirect sexual contact, such as through contact with contaminated clothing, public items, and communal sanitary facilities, accounts for a smaller portion of transmissions. Infection can also occur through contaminated blood and blood products, such as through the transfusion of blood or blood products contaminated with STD pathogens or through shared injection needles among drug users. Additionally, vertical mother-to-child transmission can happen if the infected mother passes the infection to the fetus via the placenta, during birth through the birth canal, or through breastfeeding. Therefore, STDs are transmissible.