High-risk sex is sex with strangers, including male-to-male and male-to-female sex, and refers to unprotected sex. In the process of high-risk sex will come into contact with each other’s secretions, bodily fluids and so on. If the genitals have broken skin, there may also be contact with each other’s blood, so it is very easy to spread some sexual contact diseases, such as easy to transmit AIDS, syphilis, hepatitis B, hepatitis C, genital herpes, genital warts, urethritis and other diseases.