Hey Jim..
I'm in my first year medicine so have a bit of a knowledge base on STI's (Sexually Transmitted Infections).
The common STI's are: Gonorrhea, Chlamydia and Syphilis.
The bacteria that cause these infections are not normal microflora of the mouth (Humans have resident bacteria that actually help fend off the bad guys, present on skin, and mucosal surfaces - this includes mouth, nose, vagina, etc.)
The resident microflora should not cause any infections (our immune systems are strong when we're healthy).
Hopefully you know if you or your partner have any of these infections.. (You shouldn't if you use protection, and neither of you don't sleep around, etc.)
Suave is right. If you have a cold sore you shouldn't go down on her. Cold sores are caused by a virus (Herpes Simplex) and can cause genital herpes upon contact.
If all you have is a simple cold, you should be alright... What sort of symptoms do you have?
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