Swearing works in certain musical contexts, yeah. I'm not offended by it at all because in person I tend to curse like a sailor.

But when you are consciously writing lyrics, sitting there creating wordcraft, I can't imagine writing a bunch of 4 letter words into a song. It's too cheap, too easy and in the final anaylisis, just boring. It makes the writer look uneducated and illiterate.

Only children are really impressed by swearing. Adults have heard it all before. Adding a bunch of cursing to your music will make it appeal to 13 year olds, not adults.