This species is the only non-primate to exhibit this behaviour  Oral sex has been observed in the animal kingdom among many species. This is apparent in the two Latin words for the act: At one point, CBS showcased a ginger every seconds. Research indicates that redheads have higher thresholds for pain and need less vitamin D than the rest of us thanks to the MC1R gene mutation, which gives their hair its hue. 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. Autofellatio is a possible but rare variant; autocunnilingus may also be possible for women with extremely flexible spines. 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. 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. Redheads are seen as funnier According to Professor Andrew Stott, who teaches the history of comedy at the University of Buffalo, we first began to see the circus clown as we know it — complete with face paint and brightly colored wigs — in the early 19th century. Martins , out now, by scarlet-haired writer Erin La Rosa. And while a brunette may only need one shot of Novocaine at the dentist, a redhead needs two or three. Like all aspects of sexuality, there exists a large number of variations on a theme, a few common ones being: Plate — A once common British rhyming slang for fellate that arose in the gay slang language of Polari that spread in the s. 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. 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. In Ancient Rome , fellatio was considered profoundly taboo.