More Serious Conditions
Vaginal gas that involves strong odor or fecal matter may be a result of colovaginal fistula, a serious condition involving a tear between the vagina and colon, which can result from surgery, child birth, diseases (such as Crohn's disease), and other causes. This condition can lead to urinary tract infection and other complications. This can also be a symptom of an internal female genital prolapse, a condition most often caused by child birth.
Puffs or small amounts of air passed into the vaginal cavity during cunnilingus won't cause any known issues, however "forcing" or purposely blowing air at force into the vaginal cavity can cause an air embolism, which in very rare cases can be potentially dangerous for the woman, and if pregnant, for the fetus.
Read more about this topic: Vaginal Flatulence
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