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. 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. This is apparent in the two Latin words for the act: Another suggestion is she get on hand and knees at the edge of the bed and he is kneeling on the floor. 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. The name is self-explanatory, but for a step-by-step guide: The couple engage in oral sex at the same time. This is a great position to add in sex toys such as vibrators or dildos used on her during cunnilingus , Singer recommends. 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.
Video about oral sex positions and normal sex:
Sex Positions - Oral Sex Positions