Anecdotally, I swear a lot, but my parents never did when I was growing up, at least in front of me. I started swearing like a sailor pretty young and I've never really stopped. I swear a lot in the workplace. My relationship with my parents has relaxed a lot over the years, and we enjoy swearing somewhat gratuitously in each other's company.

Some more anecdata: I realize that when I am in the company of strangers or acquaintances, a bit of casual swearing goes a long way to create a relaxed, open environment. I've had some pretty candid conversations with otherwise very serious people that I otherwise would have been very nervous or apprehensive about.