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Oral stimulation of other parts of the body (as in kissing and licking) is usually not considered oral sex.
Oral sex may be performed as foreplay to incite sexual arousal before other sexual activities (such as vaginal or anal intercourse), Like most forms of sexual activity, oral sex can pose a risk for contracting sexually transmitted infections (STIs/STDs).
Links have been reported between oral sex and oral cancer with human papillomavirus (HPV)-infected people.
In 2005, a research study at Malmö University's Faculty of Odontology suggested that performing unprotected oral sex on a person infected with HPV might increase the risk of oral cancer.
Some people complain that the thickness of the plastic dulls sensation.
A report issued in September 2005 by the National Center for Health Statistics was the basis of an article in the September 26, 2005 issue of Time magazine.
Another study in The New England Journal of Medicine suggests a correlation between oral sex and throat cancer.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.Fellatio may reduce the risk of miscarriages by inducing immunological tolerance in the woman by exposure to the proteins in her partner's semen, a process known as paternal tolerance.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.