I actually do think that swearing is unnecessary in general conversation.
There are so many words to choose from. What does it say about you if you can only fall back on the same few time after time?
I'm not talking a therapeutic curse when you've just stubbed your toe but more the "I got out of effing bed this morning and the effing dog had thrown up on my effing shoes.." conversational swearing. It's, well, frankly it's dull.
You don't need to add obscenities to your conversation, it doesn't add anything of value.
I know I sound like I am typing this with my best cat bum mouth, but I really really really do hate habitual swearing.