Well if you know her, is there any way you could find out if she has one? If she had AIDS or HIV, she could have passed that on through bleeding. I've also heard, though I'm not sure if this is true, that mouth herpes can be transferred to genital herpes through oral sex...but this would have happened regardless of blood.
It might be good to simply do a google search on STDs and find out about various ones and how they can be tranferred.
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