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Giving and receiving fellatio may happen simultaneously in sex positions like 69 and daisy chain.
Fellatio is sometimes practiced when penile penetration would create a physical difficulty for a sex partner.
By the time he enters mid-puberty he in turn participates in passing his semen on to younger males.
Among the Sambia people of Papua New Guinea, beginning at age seven all males regularly submit to oral penetration by adolescents in a six-stage initiation process, as the Sambia believe that regular ingestion of an older boy's semen is necessary for a prepubescent youth to achieve sexual maturity and masculinity.
Any sexual exchange of bodily fluids with a person infected with HIV, the virus that causes AIDS, poses a risk of infection.
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.
In fellatio the -us is replaced by the -io; the declension stem ends in -ion-, which gives the suffix the form -ion (cf. The -io(n) ending is used in English to create nouns from Latin adjectives and it can indicate a state or action wherein the Latin verb is being, or has been, performed.
Further English words have been created based on the same Latin root.