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. In Ancient Rome , fellatio was considered profoundly taboo. 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. 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. 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. 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. Cunnilingus and Fellatio Cultural views on oral sex range from aversion to high regard. The study found that 36 percent of the cancer patients had HPV compared to only 1 percent of the healthy control group. Autofellatio is a possible but rare variant; autocunnilingus may also be possible for women with extremely flexible spines. Like all aspects of sexuality, there exists a large number of variations on a theme, a few common ones being: The term is less common today. Zamora also sent a second student naked photos of herself, he told police. This is apparent in the two Latin words for the act: During one exchange, the teen told Zamora he wanted to have sex with her again, court records show. Zamora, who started working at the school less than a year ago, is due to appear in court Thursday, according to the Arizona Republic.