I adore the word fukc. It's very versitile.... I also like bollox but that's because I like how it sounds... However how you swear helps with the effect. I tend to sound quite non-descript so it's not that effective.
Now my dad is from northern Ireland and I swear to God whem he was younger every other word was a swear word, (to the point that when I told him this he actually said 'I never f'king swear' and did not see the irony), but because of his accent is always sounded a lot better than when I swore. Also, nothern accents sound a lot better when swearing in my experience.
At this point in time I would like to proclaim that I'm actually quite well spoken and try not to swear with every other word!