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Globally, sexual transmission, primarily heterosexual, is the most common mode of HIV transmission. The magnitude of risk varies with different types of sexual activity. The greatest risk per episode is with receptive vaginal or anal intercourse, which means that women are at greater risk for sexual transmission of HIV. Anal sex is somewhat riskier than vaginal sex. Although the risk with oral sex is low, there are now data to suggest that it may account for a significant minority of transmissions, particularly in sex between men.