A variety of STDs often create inflammation or ulcers in the genital area, and wounds in the skin and mucous membranes are the best gateway for HIV to enter the body. If a person with an STD, whether male or female, has sex with someone who is already infected with HIV, the HIV in the other person’s semen or vaginal secretions can invade the body through the STD lesions on the sex organs to infect them.
In addition, cervical erosion is a non-STI disease that facilitates HIV infection for women.