How much sexual contact is needed to contract HIV.

[EitherWay]

Hello, Thanks for taking the time to read this. I would like to know how much contact would be necessary to contract hiv. I asked because I just found out that from a partner that they have it. We had only had sex (Anal) for a while before I noticed blood and stopped. I had on a condom, however blood was on the base of penis. I'm afraid that some of it may have got onto the tip as I removed it. Also I would like to know if the blood on the base of the penis would be consider dangerous after a few hours and a wet wash cloth. Again no penetration without condom however I cant be 100% sure that my penis didn't make contact.    

[CurfewX]

You used a condom, which, if it does not burst WIDE open, protects you from HIV.  

As an adult, the only risk behaviors for HIV are:
1) having unprotected, penetrative vaginal or anal sex, or
2) sharing IV drug needles with other IV drug users.

If you do not do either of those things, you will never have to worry about HIV.  This includes coming into contact with blood or other bodily fluids when they are outside the body.  HIV transmission happens when a penis is inside a vagina or anus unprotected.  Fluid that was on the base of your penis is not a risk.  Fluid that touched any other part of your penis as you removed the condom - outside of the body - is not a risk for HIV.