STDs are diseases that are transmitted through sexual contact. STDs are mainly due to unclean sex, high-risk sex, thus infected with the pathogen, common STDs are syphilis, gonorrhea, condyloma acuminata, genital herpes. Infection with STDs all require a break in the skin mucous membrane, along with contact with the pathogen, and sometimes through blood transmission. Vertical transmission from mother to child. Syphilis is caused by syphilis spirochetes, gonorrhea by gram-negative diplococci, warts by human papilloma virus, and genital herpes by herpes virus. When the mucous membrane of the skin is broken and comes into contact with the above pathogens, it is easy to get infected with STDs. The best way to avoid STDs is to be clean and avoid impure sexual activity.