The concept if swear words is actually very strange. Language being created by people, the words were made and turned into taboo. Whichever ones became “swears” seems to have been done without care for which words were chosen. For example, the f-word means to engage in sexual intercourse, but the word “sex” is acceptable, and common. Two words meaning the same thing. One became vulgarity. The entire institution of vulgarity being layering connotations we created on a word we created. It would simplify everything if we could make the words socially acceptable, but the only way that could be done would be to remove the words from use and then reintroduce them several generations from now when the vulgar connotations have faded away. That being impossible, the words will go on being arbitrarily vulgarity.