I’m well aware. The metaphor, if treated literally, is rather hugely, humorously and ironically flawed, which is why it clearly isn’t meant to be treated so literally.
In the first place, it’s not a metaphor (which is why I used the quotes) — a metaphor is a figure of speech, and a good one can be illuminating, but it’s still only words. The priesthood is in some part a symbol, reflecting a reality deeper than language.