I'd be happy to swear if there were words I felt were appropriate. To me, words that describe bodily functions and sex are offensive to use as swear words because it denigrates those things.
I don't think there's anything wrong with feces or sex, and don't want them to be "bad" words. What alternate words are there besides these?
I find it just as releiving to yell a roar/grunt that doesn't insult anyone or anything.