There are many diseases besides HIV that can be passed through unprotected oral sex, including herpes, syphilis, gonorrhea, hepatitis A, and the viruses that cause warts, intestinal parasites, and other conditions. Oral sex may be practiced by people of any sexual orientation. Oral sex is not necessarily an effective method of preventing sexually transmitted infections STIs , although some forms of STIs are believed to be less commonly spread in this way, and oral sex has been recommended as a form of safe sex. Plastic wrap may also be used as a barrier during oral sex, but there exists no conclusive scientific research regarding how effective it may or may not be at preventing disease transmission. Human sexuality and sexology. Retrieved April 3,
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Comprehensive Textbook of Sexual Medicine. It sounds intimidating, but the payoff is worth it. Sex positions Oral eroticism Sexual acts. Clinical research has tentatively linked fellatio with immune modulation,  indicating it may reduce the chance of complications during pregnancy. Authorities considering it "objectionable" do so because of the penis's supposedly impure fluids coming in contact with the mouth.
Risk of STI infection, however, is generally considered significantly lower for oral sex than for vaginal or anal sex, with HIV transmission considered the lowest risk with regard to oral sex. Views Read View source View history. However, there is a potential risk of pregnancy if semen comes in contact with the vaginal area in some way, such as semen in the ejaculate finding its way onto fingers, hands, or other body parts, which then comes in contact with the vaginal area. Oral sex has been observed in the animal kingdom among many species. New Dimensions in Women's Health. An Invitation to Health Brief This article is about oral sex among humans.