I turn on current Hip Hop and every song has explicit language warning.
Yes Dre, Snoop and others all had language but it's nothing compared to today. And these would all be considered Gangster Rap for the most part.
Mainstream - California Love, Passing Me By, O.P.P, Hip Hop Hurray, Humpty Dance, Scenario, Doo Wop that thing. I could go on and on. Pretty much everything by LL Cool J and Coolio was clean for the most part as an example.