The profane vocabulary of early Vulgar Latin consisted largely of sexual and scatological words. The rich sources of religious profanity found in some of the Romance languages is normally a Christian development and usually do not appear in Classical Latin.
In Vulgar Latin, words that were considered to be profanity were described generally as obsc(a)ena, "obscene, lewd", unfit for public consumption; or improba, "improper, in poor taste, undignified".
Remember that the name Vulgar Latin simply referred to and still refers to the "common speech" of the people, not necessarily profanity; although Vulgar Latin was the form of Latin in which sexual and scatological expletives usually existed.
In the more formal Classical Latin, no profanity is recorded except in satirical works or during a discussion of the actual words.