Fellatio

Fellatio (also known as fellation, and colloquially blow job, BJ, giving head or sucking off) is an act of oral stimulation of the penis by a sexual partner or by oneself (autofellatio). It involves the stimulation of the penis by the use of the mouth, lips, tongue or throat. A person who performs fellatio on someone can be referred to as the giving partner, and the other person as the receiving partner. Fellatio is regarded by many as an erotic act in its own right and a physically intimate act. For many males, it is a turn-on which may be used by the giving partner to initiate foreplay and sexual arousal prior to sexual intercourse. The act may also be performed for the sexual gratification derived by the male receiving partner and can be continued until orgasm and ejaculation of semen.

Fellatio is also sometimes practiced when sexual intercourse can create a physical difficulty for a sex partner. For example, it may be practiced during pregnancy instead of vaginal sex by couples wishing to engage in intimate sexual activity while avoiding the difficulty of vaginal intercourse during later stages of pregnancy.