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The Pre-David-Lynch worm (as per paintings on mass market paperback books) was of the hairy butthole configuration as were those in the 2000 Syfy series.
Why do I get the feeling David-Lynch thought long and hard about the sexual symbolism of that worm?
It's more like the designs were by H.R. Giger, whose design principle was "yeah but what if it was a vagina and/or penis?"
EDIT: Not quite right. Giger did designs for Jodorowsky's failed Dune project which Lynch took over. I would still say there some elements in the movie that look quite Giger-y. But his sandworm looked like this: https://www.reddit.com/r/dune/comments/qqavbd/here_is_hr_gigers_design_for_the_sandworms_which/
Oh well that explains a lot. The dude literally elevated drawing dicks to a critical art form.