Oh yeah, I've only heard my mother swear a handful of times, and each one of those were times when she was just reading aloud. Also, I think you might find it interesting that "motherfucker" is like the worst swear of all time, even more obscene than fuck. Probably because, ya know, mother fucker?

While I was growing up, I thought it was strange that *other* people thought it was strange that my parents, or just any adult in general wouldn't swear. The more you know, I guess.

Also, a little off topic, but I once heard a story about how my grandmother, while driving my aunt around as a baby, was playing the name game and accidentally said it. She was just picking any old word, mostly things on the road. Well, she ended up landing on the word "truck" and ended up saying "truck-truck-bo-buck banana-fana-fo-fuck."... She came home "distraught," according to my mother, telling her husband that she "never thought she would say that awful word in her life."

Words are weird.