How did AIDS spread, exactly?

I don't understand how it could affect so many people if it was spread by er, merely fucking, given that it originated in Africa recently.

Am I the only one who fails to see what the fuck you retards are BAAAAWWWing about?  If AIDS is *defined* as having HIV and a low T-cell count, how can you say that HIV doesn't lead to AIDS.  Logically, it's fucking OBVIOUS that if a result requires a condition, and the result is proven to exist, then that condition (at least in as many cases as there are results) leads to the result.  WTF is the issue, exactly?  There's not going to be a seperate cause for AIDS if HIV is required *by definition*.  If you've got identical symptoms to AIDS without HIV, you don't have AIDS, you have the symptoms with another cause.  WTF is the big deal?