Risk of passing HIV from a guy to girl?

The risk of transmitting HIV from a male to a female partner during unprotected vaginal intercourse varies based on several factors. According to the World Health Organization (WHO), the average per-act probability of HIV transmission from a man to a woman through unprotected vaginal sex is approximately 0.04% (0.0004) or 4 per 10,000 acts. However, it's important to note that this is an average estimate and the risk can vary depending on specific circumstances.

Factors that can influence the risk of HIV transmission from a male to a female partner during unprotected vaginal intercourse include:

- Presence of other sexually transmitted infections (STIs): Having other STIs, such as herpes simplex virus (HSV), syphilis, or gonorrhea, can increase the risk of HIV transmission, as they can cause inflammation and breaks in the genital mucosa, making it easier for HIV to enter the bloodstream.

- Viral load of the infected partner: The amount of HIV present in the infected partner's body fluids (viral load) can impact the risk of transmission. A higher viral load is associated with an increased risk of transmission.

- Duration and type of sexual contact: The longer the duration of unprotected intercourse and the more intense the sexual contact (e.g., deep penetration, forceful thrusting, etc.), the higher the risk of HIV transmission.

- Use of barrier protection: Consistent and correct use of condoms can significantly reduce the risk of HIV transmission. Condoms provide a physical barrier that prevents the exchange of bodily fluids and significantly lower the risk of infection.

- Circumcision: Circumcised males have a lower risk of transmitting HIV to their female partners compared to uncircumcised males. Circumcision reduces the amount of HIV-infected cells on the surface of the penis, thereby decreasing the risk of transmission.

It is important to note that unprotected sex with any partner, regardless of gender, carries the risk of transmitting or acquiring HIV. Practicing safe sex by using condoms, getting tested for HIV and other STIs regularly, and communicating openly with your partner(s) about sexual health are essential for preventing HIV transmission and maintaining good sexual health.