I think it all started back in 1990 (or was it 91) when Dr. Dre released the chronic. He and Snoop Dogg sang that song "Bitches aint shit but hoes and tricks" which then created a new level of talking to the ladies. Bitches, whores, the only thing left was 'sluts' and people just filled that in.
I did listen to Snoop and Dre hardcore, however I try to refrain from using those terms in every day talk...
Why you might ask? Well let me tell you...
VANILLAICE4LIFE! Word to yo mutha.
http://www.vanillaice.com/