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Hello- To put it simply, oral sex involves both the genitals and the oral cavity. You may think of the genitals as the main risk factor, but keep in mind that the oral cavity can hold over 600 different bacterial species, not all of which are "friendly". In general, STDs aside, it's safer to have oral sex with a person who practices meticulous oral care. Menstruation does bring a few issues of its own. Though oral transmission of various sexually transmitted diseases is not discussed all that much, it is indeed possible to spread STDs like HIV, herpes, gonorrhea, and others in this way. Semen, vaginal secretions, and saliva, are all bodily fluids that can facilitate this, though saliva very rarely leads to HIV infection. Menstrual blood is a different matter. Men who have oral sex with a HIV positive partner during her period will increase their risk of becoming infected themselves, especially if they have known injuries or gum disease in their mouths. Conversely, a HIV positive man with gum disease or oral injuries can pass the infection onto his female partner.
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