I used the "F" word once during a standoff with my long since Ex, when I stood up to one of his more threatening bluffs. Though at the time--- I wouldn't have bet the bank on it having been a bluff. I was that scared. And another time, M-A-N-Y years prior when one of my sister's boyfriends decided to be an arse with me. My entire family supported the action I had taken that evening.... they knew I never used that word. And my sister quickly showed him that oh so proverbial door.
During a character's development, you get to know when certain verbiage just isn't quite the same. "‘What the Hell’s going on back there?’" would not have emoted the same anger. And Perrie Stevens/Dellesseea N'Syis is mindful that he grew up on the streets of the Eastern WestSector. Therefore I had no reservations of using the "F" word in its stead.
Blessings, L.L. Abbott