Oral sex is sexual activity involving the stimulation of the genitalia of a sex partner by the use of the mouth, tongue, teeth or throat. Cunnilingus refers to oral sex performed on females while fellatio refer to oral sex performed on males. Anilingus refers to oral stimulation of a person's anus. Oral stimulation of other parts of the body (as in kissing and licking) is usually not considered oral sex. People may engage in oral sex as part of foreplay before sexual intercourse, during, or as intercourse.

Facesitting is a form of oral sex in which the receiver sits on the giver's face and pushes into it with his or her genitals. Oral sex can be performed by both partners at the same time in the so-called "sixty-nine" position.

Spitting and/or swallowing of the ejaculatory fluids or giving a pearl necklace may cause different sexual stimulations.

Autofellatio is a possible but rare variant; autocunnilingus may also be possible for women with extremely flexible spines.

An act of group sex restricted to one woman giving oral sex to several men is referred to as a gangsuck, blowbang or lineup, all derivatives of the slang expression gang bang for group sex. Bukkake and gokkun may also involve oral sex, though not necessarily.

In biology, sexual reproduction is a process of combining and mixing genetic traits, often resulting in the specialization of organisms into a male or female variety, each known as a sex. Sexual reproduction involves combining specialized cells (gametes) to form offspring that inherit traits from both parents. Gametes can be identical in form and function (known as isogametes), but in many cases an asymmetry has evolved such that two sex-specific types of gametes (heterogametes) exist: male gametes are small, motile, and optimized to transport their genetic information over a distance, while female gametes are large, non-motile and contain the nutrients necessary for the early development of the young organism.

An organism's sex is defined by the gametes it produces: males produce male gametes (spermatozoa, or sperm) while females produce female gametes (ova, or egg cells); individual organisms which produce both male and female gametes are termed hermaphroditic. Frequently, physical differences are associated with the different sexes of an organism; these sexual dimorphisms can reflect the different reproductive pressures the sexes experience.

Drew Blyth Barrymore (born February 22, 1975) is an American actress, film director, screenwriter, producer and model. She is a member of the Barrymore family of American actors and granddaughter of John Barrymore. She first appeared in an advertisement when she was 11 months old. Barrymore made her film debut in Altered States in 1980. Afterwards, she starred in her breakout role in E.T. the Extra-Terrestrial. She quickly became one of Hollywood's most recognized child actresses, going on to establish herself in mainly comic roles.

Following a turbulent childhood which was marked by drug and alcohol abuse and two stints in rehab, Barrymore wrote the 1990 autobiography, Little Girl Lost. She successfully made the transition from child star to adult actress with a number of films including Poison Ivy, Bad Girls, Boys on the Side, and Everyone Says I Love You. Subsequently, she established herself in romantic comedies such as The Wedding Singer and 50 First Dates.

In 1995, she and business partner Nancy Juvonen formed the production company Flower Films, with its first production the 1999 Barrymore film Never Been Kissed. Flower Films has gone on to produce the Barrymore vehicle films Charlie's Angels, 50 First Dates, and Music and Lyrics, as well as the cult film Donnie Darko. Barrymore's more recent projects include He's Just Not That into You, Beverly Hills Chihuahua, Everybody's Fine and Going the Distance. A recipient of a star on the Hollywood Walk of Fame, Barrymore appeared on the cover of the 2007 People magazine's 100 Most Beautiful issue.