You should use your judgement. If the cursing is attached to the character eg. If the character is really expressive, then don't completely take out all the curses. I think it's always better not to have characters curse because more people will respect the story that way, but if the character curses a lot in the movie you shouldn't ignore it.
If you want more people to watch your series I reccomend you not use that many curses - but if your charecter gets hurt/sad/angry those are appropriate times to curse, not if your in a random conversation. If you use a curse like every 10 seconds, I personally wouldn't watch it :/.
Hope this advise is helpful.
Absolutely not. If you are intelligent enough to compose a story,then you should be smart enough to use your vivid imagination in order to substitute non-offensive language for profanity.