Re: Diseases
It is not spread by sexual contact only.
The disease has been around for long time no one can be sure.
It also affects animals like chimpanzes (west Africa) but a different type of virus. HIV-2. Not HIV-1 which affcted human. This was discovered in 1999.
It hit the news faster when some people got infected. Gay males in NY and CA. Later some ‘celeberities’/actors/porn stars and people in sports.
It bacame known only in early 1980’s, not before that.
It’s not known that human had sex with chimpanzes to get these viruses. Not even included in many acceped theories how it got to human. 
These theories do include conspiracy theory as mentioned above. Others are hunters getting infected (most accepted), contaminated needle, vaccines or few others.