Can HIV be contracted by giving oral sex to an HIV positive man and getting his pre-ejaculatory fluid in your mouth? What about his semen on your skin/?I'm sorry, I'm pretty ignorant when it comes to HIV/AIDS.

No need to apologize! Oral sex is considered a low risk activity, because there are enzymes in our mouths that pretty much destroy the virus. Unless you have massive open sores/cuts in your mouth, then it's usually not a high risk route of transmission. Same with skin, it acts as a barrier, as HIV is a weak virus. Our genitals, however, consist of mucous membranes, which attract the virus easier then say our skin. Men, on the other hand, have a harder time contracting HIV because the penis is covered in skin, although still VERY possible. Hope this helped
-S-

with that in mind, what is the length of time hiv can survive outside the body?

Ive heard 2 min.

Hiv through oral sex is very slim but any unprotected sex has its risks not just for hiv but a very long line of other (STD)
As far as hiv on the skin it can't get through unless it is either forced through ( VIA NEEDLE SHOOTING) or direct blood to blood contact ( and even that is slim BUT possible )
Hiv cannot pass through ( INTACT SKIN )
My best advice to you is ( if you're worried )
To get tested 3 months after last possable exposure .
You're test will be conclusive at the 3 month mark .
In good health ..............
............. Lost Spirit .............