Strictly speaking, only diseases transmitted through sexual intercourse are true STDs, and this concept has not changed over the decades, such as syphilis, gonorrhea, soft chancre, and venereal lymphogranuloma. In recent years, diseases that were not originally STDs have increased due to the increase in extra-marital sex between men and women, so these diseases are also on the rise, so in 1975 the World Health Organization included these diseases in the scope of STDs, and referred to the previously known STDs and these diseases collectively as sexually transmitted diseases, or STDs for short, which include non-gonococcal urethritis, vaginitis, genital herpes, condyloma acuminata, glans vulgaris, pubic lice, AIDS, etc. etc. The mode of transmission for these patients seen in clinical practice is still sexual intercourse. However, indirect modes of transmission still exist such as clothing, bath tubs, swimming pools, etc. Especially people with weakened body resistance, fatigue, pruritic skin disease of the pubic area, excessive leukorrhea, use of hormones or immunosuppressants, masturbators, ringworm, eczema are susceptible to infection and sometimes contaminated by hand.