It depends on who I'm with, really. There's one person in my life that I try not to swear around at all. But there are other people that I'm around where every other word is a swear. It's just a matter of who I'm dealing with and the location where I'm at.
That's for speaking though. In writing, it's very rarely. Only when I'm writing about something that happened and the words just fit. Or if I'm writing about someone who has a nickname that is a swear.
I used to care about hearing other people swearing, and would look down on them for it. These days, I don't have the mental energy for it. If other people swear however often, it's whaterver.