Yes, for a male. If you are female, the chances are higher.
Aj
Could you clarify that? Are you saying that having unprotected sex with a partner having HIV will result in only a 1/1000 or 1/2000 chance of contracting the virus?
I wouldn't be worried at all, unless your partners have been sleeping with men who also have sex with men, or if they inject drugs or have had partners who do.
Even if one of your partners does have HIV, your chances of getting it are 1/1000 or 1/2000. Its not likely at all that you would get it.
Aj