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.

>>34
lol faggot do you know how they define AIDS? If someone gets say pneumonia and they have HIV then it's called AIDS. If they don't have HIV it's just called pneumonia. Same for just about every other "AIDS" disease. It's a self-fulfilling prophecy.