The term is less common today. 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. Another study in The New England Journal of Medicine suggests a correlation between oral sex and throat cancer. 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. 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. 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. 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 study found that 36 percent of the cancer patients had HPV compared to only 1 percent of the healthy control group. A play on the slang term head resulted in the slang term brains, or brain salad surgery, domes or getting domes. 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. 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. 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. Cunnilingus and Fellatio Cultural views on oral sex range from aversion to high regard. Bukkake and gokkun may also involve oral 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. 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.