Unknown but low risk: Oral HPV infections can occur -- on average, they are roughly one tenth as frequent as genital infections. For the most part, oral sex can be considered low risk for HPV, but not zero risk. There are no data on the transmission chance for any single oral sex event, but I would guess it's a lot lower than 1 in a thousand (in either direction, i.e. genital to oral or vice versa).
Answered 11/30/2014
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