what kinda STD's can you get from performing/receiving oral sex?

i have a few questions about STD's and i'm hoping that some1 would give me some information about it:

1)
A- i was wondering if any1 could tell me, if you can get STD's from oral sex... what kinda STD's you can get from performing/receiving oral sex?
B- and also... is there any visible signs that would give away if a man may have an STD that could be transmitted through oral sex?

2) i have been told that the risk of getting HIV thru oral sex is very small.. but.. i am not sure whether that's true or not... if you are performing oral sex on a man, and whether you know it or not, he's HIV positive, and he precomes... could you get HIV? what if he ejaculates in ur mouth?

3)
A- and lastly... what about rimming? can you get STD's by rimming?
B- and is there any visible signs if the person has some kinda STD that you could get through rimming?
what kinda answer is that? u r a doctor and u can't answer my question properly... and u suggest viagra? lol

if that would be the solution for everything... i guess there wouldn't be any sick patients today
 
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