I'm more referring to the type of game it is now though, rather than the franchise. The levels of crude and obscene humour in South Park: Stick of Truth is off the charts. Going as far as beastiality and abortions.
Well, South Park as a whole has gotten more crude as time went on. Compare just the TV series.
But the original game was by no means a pg game.
Also don't forget games like Conkers Bad Fur day on the N64.