Fellatio is oral sex performed upon the human male penis. It may be performed to induce orgasm and ejaculation of semenor it can be used as foreplay prior to vaginal or anal forms of intercourse.
 
Although the technique always involves sucking not blowing, the sex-act of fellatio (or, more precisely, fellating to the point of orgasm) is commonly referred to as a blowjob. Fellatio (but also cunnilingus) is sometimes referred to as "giving head".
 
Some receivers regard receiving oral sex as an ego boost, believing that such an act is a form of dominance over their sexual partner because of the overt submissive nature of the act; the giver must often be on their knees before the receiver to perform the act of pleasure In ancient Greece, fellatio was referred to as "playing the flute"; the Kama Sutra has a chapter on oparishtaka, or “mouth congress
 

Often referred to as BJ, Blow Job, 69, head.