The infection is mainly transmitted through direct sexual contact, i.e. through various direct sexual contacts such as vaginal intercourse, oral sex, anal sex, etc. Since there is sufficient amount of pathogens in the genital lesions of one party during sexual intercourse, the skin and mucous membrane of the other party may come into direct contact with the pathogens; friction during sexual intercourse is likely to form damage to the skin and mucous membrane, which is conducive to the entry of pathogens. In addition to the genital, anorectal, oral and other parts of the infection caused by sexual intercourse, other sex-related behavior such as kissing, mutual masturbation and other parts of the mouth, lips, eyes, nose, breasts, fingers and other parts of the genital infection can also occur, but relatively rare. Indirect infection can occur through contaminated clothing, bedding, towels, toilets, bath tubs, etc. through contact with broken skin mucous membranes, but general daily contact such as shaking hands, hugging, eating, etc. is not infectious.