Air into the vagina can cause an embolism ( Embolism can be classified as whether it enters the circulation in
arteries or
veins. ), This would be very rare, usually only where the woman was pregnant, recently gave birth , or had hypertension (high blood pressure ) and mechanical means were used as you are describing, and/or a seal was made where no air could escape/be released, worse case scenario = death,really knot worth takn the chance, jus sayin. However I am knot a doctor of medicine, I would advise knot blowing into the vagina...also a blowjob does knot involve blowing,*wink*
MA