Do you mean like showing scrambled expletives, Barret and Cid style? Or like PG-13 words? Zell used a fair amount in FFVIII, and there was one "bastard" dropped in FFIX (Zidane, Disc III, Exiting Pandemonium). I don't think much was dropped in FFX. Expletives work well in voice acting if the actors are comfortable with saying it - Metal Gear Solid was a great example.