What are the chances of contracting HIV through unprotected anal sex?

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If you both do not have HIV (human immunodeficiency virus), then from where can HIV come?

Only certain body fluids from a person who is infected with HIV (Human Immunodeficiency Virus) can transmit the infection to an uninfected person through sex (anal, vaginal, or oral), through blood transfusion, and exchange of syringes during intravenous drug use. An HIV-infected mother can transmit HIV to the child during pregnancy, delivery or through breast milk. Unprotected anal sex is considered to be the riskiestfor sexually transmitted diseases due to the anatomy of the anus. It is narrow passage and does not self-lubricate. Anal skin is very fragile and likely to tear during the act, and thus forms the easy passage for pathogens to pass into the blood stream. Pathogens love the warm and moist environment of the anus. Therefore, a person who has HIV or for that matter any STDs (Sexually Transmitted Diseases), it becomes an easy passage for transmission. Therefore barrier contraceptives (consistent and correctively using condoms) are recommended, which prevents not only HIV but also other STDs. But if you both do not have HIV and other STDs, it cannot be transmitted in a monogamous relationship. These infections are transmitted when an infected person has unsafe sex with an uninfected person. Hope your query is answered, but if you still have any other query, please revert. Best wishes.