Can you contract any STDs from unprotected Oral Sex, and if so which?

Herpes I know for sure. Others I'd have to check.

Edit: WebMD says HIV is possible, but very unlikely. Herpes and the bacterial infections are more likely (Chlamydia, etc).

Yep yep what he said.... Mouth and throat cultures can be done to look for STDs.

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By the way, I want to qualify what I've said that I know what I know for precautions only. I do not now have any of the above.
"Clean bill of health" comes to mind.

Anything bacterial or viral (although HIV is believed to be very rare this way as your saliva tends to deal with it (apparently).