The ck in fuck is a sound made deep in the throat and produces a rasping noise. In nature animals will mimic other animals to signal danger. Cats hiss like snakes and snakes are often dangerous. Curse words are a form of mimicry of danger. The words are often harsh sounding - guttural and predatory - as an attempt to mimic dangerous sounds.
Men curse more than women. Men also write in more masculine ways than women. Men prefer short words, often germanic words, with hard endings to them. Women prefer latin and soft sounding words. It's possible to tell the sex of a writer from the words they use with a high level of accuracy.