Receptive anal intercourse is extremely risky for the transmission of HIV because

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The membrane lining the rectum is thin and delicate, making it more susceptible to tearing during anal intercourse. This can expose blood vessels and increase the risk of HIV transmission. Additionally, semen and other bodily fluids can contain high levels of HIV, which can easily enter the bloodstream through these tears in the rectal lining. The presence of feces does not necessarily increase the risk of HIV transmission, as HIV is not typically present in feces. Leukocytes may be present in the colon, but this is not the primary factor that makes receptive anal intercourse risky for HIV transmission. The virus cannot enter the stomach through the digestive system, as it is broken down by stomach acid.

Receptive Anal Intercourse Is Extremely Risky for the Transmission of HIV