A blowjob is an oral sex act performed on a penis involving the use of the mouth (lips and tongue) and including the throat. Also known as a BJ, fellatio, "giving head", "sucking off", or a hummer, this activity can be arousing to both parties involved and can culminate in an orgasm for the person being fellated. Since it does not involve the penetration of either a vagina or anus, some do not consider oral sex as affecting the status of their virginity. It is also popular among couples who are not ready for intercourse, or those who want to avoid the risk of pregnancy.