True that's a myth, but the term existed in the 1500's as a word for coitus, derived from many sources. Some point to how it came from Germanic dialects, meaning to plough,or even Latin. I think there's no denying the word meant what it means now, and probably in a less vulgar way, but then I can see how certain people choose to omit it from their work. Me personally? I only use it a couple times, in the same way it would have been historically used... as a less than polite way of describing the act itself. What can I say? I write more than a few unsavory types and their language reflects that.