Fellatio is oral sex performe upon the male penis. It may be performed to induce orgasm and ejaculation of semen or it can be used as foreplay prior to vaginal or anal forms of intercourse. Although the technique usually involves sucking more than blowing, the sex-act of fellatio (or, more precisely, fellating to the point of orgasm) is commonly referred to as a blow job. Fellatio is sometimes referred to as "giving head", although this term can also apply to cunnilingus.