It's a good question. Rather than post and rely on the answers of lay-people (I know, all puns are bad....) I get my information from the CDC.
http://www.cdc.gov/search.do?q=std&b...ult_collection
It's a bit more correct than the Wiki...
Here's a question. What if you know for certain that a provider
has an STD? What will you do then? You say you just won't do her well, what about hepatitis? Are you going to stare at her and see if she turns yellow?
As for the oral info, that's correct. Saliva is pretty efficient at killing unfriendlies, It's not only the first step in digestion, it's also a first defense for the immune system. Don't floss less than than 4 hours before oral contact, no untreated tooth decay. You can use a product like "Dent Temp" to fill an unaddressed dental cavity for a temporary fix until you get to a dentist. Things like that can offer an entry point for pathogens.
There are a couple of barriers that can also help. Orabase and Zilactin are over the counter products that are usually used to treat oral ulcers but you can use them as an oral barrier to make your mouth a less hospitable environment for "critters". This is not medical advice and you should always ask your doctor about products like this before using them. Yada yada.
A very well known provider asked me about these products recently and I couldn't remember their names. I know you're reading this post, I hope this helps