性病属于传染性疾病,从广义上说,传染病的预防可以分为三级预防、二级预防、一级预防。一级预防是防止感染某种疾病,包括对健康人进行健康教育;二级预防,主要是对病人进行处理、治疗,以切断传染源;三级预防,是指防止患病后残疾,促进康复。本文所说的“防身 STDs are contagious diseases. In a broad sense, the prevention of infectious diseases can be divided into tertiary prevention, secondary prevention and primary prevention. Primary prevention is to prevent infection of a disease, including health education for healthy people; secondary prevention, mainly for the treatment of patients, treatment to cut off the source of infection; tertiary prevention, is to prevent illness after disability and promote rehabilitation . This article said ”self-defense