I totally swear when I stub my toe, when I forget something and I'm half way to work, but I never feel need the need to interject swears into common sentences.

People comment that I don't swear often -- usually uncomfortably checking if I'm against it-- I'm not, I work in finance where there is a lot of swearing done and don't mind. Its just not part of the vocab I use.

Interesting twist for me is that now that the kids are all grown up my mother swears and said she swore a lot before kids but 'gave it up' to make the rule real. Totally hard for my brain to handle.