Oral sex may be practiced by people of any sexual orientation. Sexual variants 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 also be performed by both partners at the same time in the so-called "sixty-nine" position. 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 term gang bang for group sex. Bukkake and gokkun may also involve oral sex. Preserving virginity A late 19th century Beijing hand scroll depicting oral sex Oral sex is commonly used as a means of preserving virginity , especially among heterosexual pairings; this is sometimes termed technical virginity which additionally includes anal sex , mutual masturbation and other non-penetrative sex acts, but excludes penile-vaginal sex.
In humans, there is no connection between the gastrointestinal system and the reproductive system , [nb 1] and sperm ingested by the woman would be killed and broken down by acids in her stomach and proteins in the small intestine.
The breakdown products are then absorbed as a negligible quantity of nutrients. However, there is a potential risk of pregnancy if semen comes in contact with the vaginal area in some way, such as semen in the ejaculate finding its way onto fingers, hands, or other body parts, which then comes in contact with the vaginal area.
Oral sex is not necessarily an effective method of preventing sexually transmitted infections STIs , although some forms of STIs are believed to be less commonly spread in this way, and oral sex has been recommended as a form of safe sex. A makeshift dental dam can be made out of a condom  or a latex or nitrile glove ,  but using a real dental dam is seen as preferable; this is because real dental dams cover a larger area, avoid accidents caused by "slipping" outside the covered area, and avoid the risk that makeshift versions may be accidentally damaged or poked with the scissors during the cutting procedure.
Plastic wrap may also be used as a barrier during oral sex, but there exists no conclusive scientific research regarding how effective it may or may not be at preventing disease transmission. Certain kinds of plastic wrap are manufactured to be microwaveable and are designed to have pores that open when heated, but there also exists no scientific research on what effect, if any, this has on disease transmission when used during oral sex. Prevalence A report issued in September by the National Center for Health Statistics was the basis of an article in the September 26, issue of Time magazine.
The report comes from the results of a computer-administered survey of over 12, Americans between the ages of 15 and 44, and states that over half the teenagers questioned have had oral sex. While some headlines have interpreted this as evidence that oral sex among teenagers is "on the rise", this was the first comprehensive study of its kind to examine the matter.
Risk of STI infection, however, is generally considered significantly lower for oral sex than for vaginal or anal sex, with HIV transmission considered the lowest risk with regard to oral sex. Because of the aforementioned factors, medical sources advise the use of condoms or other effective barrier methods when performing or receiving oral sex with a partner whose STI status is unknown.
The study found that 36 percent of the cancer patients had HPV compared to only 1 percent of the healthy control group. Another study in The New England Journal of Medicine suggests a correlation between oral sex and throat cancer. It is believed that this is due to the transmission of HPV, a virus that has been implicated in the majority of cervical cancers and which has been detected in throat cancer tissue in numerous studies.
The study concludes that people who had one to five oral sex partners in their lifetime had approximately a doubled risk of throat cancer compared with those who never engaged in this activity and those with more than five oral sex partners had a percent increased risk.
While any exposure to a partner's semen appears to decrease a woman's chances for the various immunological disorders that can occur during pregnancy, immunological tolerance could be most quickly established through the oral introduction and gastrointestinal absorption of semen. Cunnilingus and Fellatio Cultural views on oral sex range from aversion to high regard.
In Ancient Rome , fellatio was considered profoundly taboo. This is apparent in the two Latin words for the act: Under this system, it was considered to be abhorrent for a male to perform fellatio, since that would mean that he was penetrated controlled , whereas receiving fellatio from a woman or another man of lower social status such as a slave or debtor was not humiliating.
The Romans regarded oral sex as being far more shameful than, for example, anal sex — known practitioners were supposed to have foul breath and were often unwelcome as guests at a dinner table. Terminology and slang There are many words which refer to oral sex, including euphemisms and sexual slang. Like all aspects of sexuality, there exists a large number of variations on a theme, a few common ones being: Giving head — A common slang term for giving oral sex to either a man or woman is giving head, from the term head job in contrast to hand job , manual stimulation.
A play on the slang term head resulted in the slang term brains, or brain salad surgery, domes or getting domes. Plate — A once common British rhyming slang for fellate that arose in the gay slang language of Polari that spread in the s. The term is less common today. Additionally, in lesbian culture, several common slang terms used are carpet munching, giving lip, lip service or tipping the velvet a faux-"Victorian" expression invented by novelist Sarah Waters.
Other slang terms for oral sex include going down on male or female , licking out and muff diving female , blow job male , dome male or female , sucking off male , playing the skin flute male recipient , rolling cigars male recipient , lolly-gagging gay male-on-male , gaining knowledge male recipient and bust down male.
Forced fellatio is often called Egyptian rape or simply Egyptian; this goes back to the time of the Crusades when Mamluks were alleged to force their Christian captives to do this. This species is the only non-primate to exhibit this behaviour  Oral sex has been observed in the animal kingdom among many species. These bat pairs spend more time copulating if the female licks the male than if she does not.