High-risk sex is behavior in which a man and a woman have intercourse without relative protection, and high-risk is behavior that has the potential to infect with HIV. The most vulnerable to HIV infection, such as a certain exchange of bodily fluids that occurs between men and women, homosexuals. The most susceptible to infection are behaviors that lack self-protection, such as sharing the same needle for blood collection, not using condoms during intercourse, or even personal behaviors that can easily cause infection. Among women, personal behavior is the exchange of bodily fluids with sexual partners, such as not being prepared or having several sexual partners at the same time, which can easily lead to the spread of HIV. Without any safety precautions, it is a high-risk behavior to let someone’s bodily fluids such as semen, breast milk, blood secretions, etc., enter one’s genital tract.