Bukkake and gokkun may also involve oral sex. The study found that 36 percent of the cancer patients had HPV compared to only 1 percent of the healthy control group. 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. Plate — A once common British rhyming slang for fellate that arose in the gay slang language of Polari that spread in the s. Terminology and slang There are many words which refer to oral sex, including euphemisms and sexual slang. 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. 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. 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. 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. 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. Autofellatio is a possible but rare variant; autocunnilingus may also be possible for women with extremely flexible spines. 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. 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. 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. Oral sex can also be performed by both partners at the same time in the so-called "sixty-nine" position. 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.