A study published in The New England Journal of Medicine in 2007 showed a greater risk for oropharyngeal cancer in people that had had oral sex with at least six different partners.
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The CDC's Advisory Committee on Immunization Practices allows but doesn’t require boys as young as 9 to get Gardasil.
Among adults, oral sex causes stress for some couples and enhances intimacy for others, says sex therapist Louanne Cole Weston, Ph D, of Fair Oaks, Calif.
Researchers noticed an increase in this kind of cancer among people who hadn't been very prone to it before.
It began to affect increasing numbers of people around the age of 40 that didn't smoke or drink, whereas in prior decades these cancers were usually found in older people that smoked cigarettes and heavily drank hard liquor.
For example, Warren says she might stress the importance of condom use for a man having oral sex with multiple male partners. And they don't view it as very risky, says Bonnie Halpern-Felsher, Ph D, a pediatrics professor at the University of California, San Francisco.