I had a very sheltered upbringing, and when my future husband took me up to London to see a show, I had to ask the meaning of the words daubed on the walls of the tube, to his astonishment!
Have always hated swearing, my children know this and don't swear in front of me, the DH has been known to let fly, followed by apology when he calms down. But blasphemy actually makes me feel ill it is so upsetting. In one of my first places of work, one of the ladies regularly used to say 'Jesus wept', and in the end I plucked up courage to ask her not to use that expression. It actually worked, and she didn't do it again, not only that, but she used to apologise for any swear word in my presence. If people can actually control themselves, then why don't they? 