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the correct answer has to do with the ph of saliva.
saliva is slightly acidic, as is urine.
semen is mostly alkaline ph.
the biologic response know as "pre-cum" is to prep the urethra and change it's acidic ph to alkaline so sperm is not damaged.
semen needs an alkaline environment to survive, acidic environments approach sterility---this is why blowing a load in someone's mouth is mostly safe unless, as others have indicated there is a sore open to bloodstream.
class dismissed.
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